xref: /illumos-gate/usr/src/lib/libzfs/common/libzfs_dataset.c (revision 0dfe541e)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 */

/*
 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
 * Copyright (c) 2011, 2016 by Delphix. All rights reserved.
 * Copyright (c) 2012 DEY Storage Systems, Inc.  All rights reserved.
 * Copyright (c) 2011-2012 Pawel Jakub Dawidek. All rights reserved.
 * Copyright (c) 2013 Martin Matuska. All rights reserved.
 * Copyright (c) 2013 Steven Hartland. All rights reserved.
 * Copyright (c) 2014 Integros [integros.com]
 * Copyright 2018 Nexenta Systems, Inc.
 * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
 * Copyright 2017-2018 RackTop Systems.
 */

#include <ctype.h>
#include <errno.h>
#include <libintl.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
#include <stddef.h>
#include <zone.h>
#include <fcntl.h>
#include <sys/mntent.h>
#include <sys/mount.h>
#include <priv.h>
#include <pwd.h>
#include <grp.h>
#include <stddef.h>
#include <ucred.h>
#include <idmap.h>
#include <aclutils.h>
#include <directory.h>
#include <time.h>

#include <sys/dnode.h>
#include <sys/spa.h>
#include <sys/zap.h>
#include <sys/dsl_crypt.h>
#include <libzfs.h>
#include <libzutil.h>

#include "zfs_namecheck.h"
#include "zfs_prop.h"
#include "libzfs_impl.h"
#include "zfs_deleg.h"

static int userquota_propname_decode(const char *propname, boolean_t zoned,
    zfs_userquota_prop_t *typep, char *domain, int domainlen, uint64_t *ridp);

/*
 * Given a single type (not a mask of types), return the type in a human
 * readable form.
 */
const char *
zfs_type_to_name(zfs_type_t type)
{
	switch (type) {
	case ZFS_TYPE_FILESYSTEM:
		return (dgettext(TEXT_DOMAIN, "filesystem"));
	case ZFS_TYPE_SNAPSHOT:
		return (dgettext(TEXT_DOMAIN, "snapshot"));
	case ZFS_TYPE_VOLUME:
		return (dgettext(TEXT_DOMAIN, "volume"));
	case ZFS_TYPE_POOL:
		return (dgettext(TEXT_DOMAIN, "pool"));
	case ZFS_TYPE_BOOKMARK:
		return (dgettext(TEXT_DOMAIN, "bookmark"));
	default:
		assert(!"unhandled zfs_type_t");
	}

	return (NULL);
}

/*
 * Validate a ZFS path.  This is used even before trying to open the dataset, to
 * provide a more meaningful error message.  We call zfs_error_aux() to
 * explain exactly why the name was not valid.
 */
int
zfs_validate_name(libzfs_handle_t *hdl, const char *path, int type,
    boolean_t modifying)
{
	namecheck_err_t why;
	char what;

	if (entity_namecheck(path, &why, &what) != 0) {
		if (hdl != NULL) {
			switch (why) {
			case NAME_ERR_TOOLONG:
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "name is too long"));
				break;

			case NAME_ERR_LEADING_SLASH:
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "leading slash in name"));
				break;

			case NAME_ERR_EMPTY_COMPONENT:
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "empty component in name"));
				break;

			case NAME_ERR_TRAILING_SLASH:
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "trailing slash in name"));
				break;

			case NAME_ERR_INVALCHAR:
				zfs_error_aux(hdl,
				    dgettext(TEXT_DOMAIN, "invalid character "
				    "'%c' in name"), what);
				break;

			case NAME_ERR_MULTIPLE_DELIMITERS:
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "multiple '@' and/or '#' delimiters in "
				    "name"));
				break;

			case NAME_ERR_NOLETTER:
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "pool doesn't begin with a letter"));
				break;

			case NAME_ERR_RESERVED:
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "name is reserved"));
				break;

			case NAME_ERR_DISKLIKE:
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "reserved disk name"));
				break;

			default:
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "(%d) not defined"), why);
				break;
			}
		}

		return (0);
	}

	if (!(type & ZFS_TYPE_SNAPSHOT) && strchr(path, '@') != NULL) {
		if (hdl != NULL)
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "snapshot delimiter '@' is not expected here"));
		return (0);
	}

	if (type == ZFS_TYPE_SNAPSHOT && strchr(path, '@') == NULL) {
		if (hdl != NULL)
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "missing '@' delimiter in snapshot name"));
		return (0);
	}

	if (!(type & ZFS_TYPE_BOOKMARK) && strchr(path, '#') != NULL) {
		if (hdl != NULL)
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "bookmark delimiter '#' is not expected here"));
		return (0);
	}

	if (type == ZFS_TYPE_BOOKMARK && strchr(path, '#') == NULL) {
		if (hdl != NULL)
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "missing '#' delimiter in bookmark name"));
		return (0);
	}

	if (modifying && strchr(path, '%') != NULL) {
		if (hdl != NULL)
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "invalid character %c in name"), '%');
		return (0);
	}

	return (-1);
}

int
zfs_name_valid(const char *name, zfs_type_t type)
{
	if (type == ZFS_TYPE_POOL)
		return (zpool_name_valid(NULL, B_FALSE, name));
	return (zfs_validate_name(NULL, name, type, B_FALSE));
}

/*
 * This function takes the raw DSL properties, and filters out the user-defined
 * properties into a separate nvlist.
 */
static nvlist_t *
process_user_props(zfs_handle_t *zhp, nvlist_t *props)
{
	libzfs_handle_t *hdl = zhp->zfs_hdl;
	nvpair_t *elem;
	nvlist_t *propval;
	nvlist_t *nvl;

	if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0) {
		(void) no_memory(hdl);
		return (NULL);
	}

	elem = NULL;
	while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
		if (!zfs_prop_user(nvpair_name(elem)))
			continue;

		verify(nvpair_value_nvlist(elem, &propval) == 0);
		if (nvlist_add_nvlist(nvl, nvpair_name(elem), propval) != 0) {
			nvlist_free(nvl);
			(void) no_memory(hdl);
			return (NULL);
		}
	}

	return (nvl);
}

static zpool_handle_t *
zpool_add_handle(zfs_handle_t *zhp, const char *pool_name)
{
	libzfs_handle_t *hdl = zhp->zfs_hdl;
	zpool_handle_t *zph;

	if ((zph = zpool_open_canfail(hdl, pool_name)) != NULL) {
		if (hdl->libzfs_pool_handles != NULL)
			zph->zpool_next = hdl->libzfs_pool_handles;
		hdl->libzfs_pool_handles = zph;
	}
	return (zph);
}

static zpool_handle_t *
zpool_find_handle(zfs_handle_t *zhp, const char *pool_name, int len)
{
	libzfs_handle_t *hdl = zhp->zfs_hdl;
	zpool_handle_t *zph = hdl->libzfs_pool_handles;

	while ((zph != NULL) &&
	    (strncmp(pool_name, zpool_get_name(zph), len) != 0))
		zph = zph->zpool_next;
	return (zph);
}

/*
 * Returns a handle to the pool that contains the provided dataset.
 * If a handle to that pool already exists then that handle is returned.
 * Otherwise, a new handle is created and added to the list of handles.
 */
static zpool_handle_t *
zpool_handle(zfs_handle_t *zhp)
{
	char *pool_name;
	int len;
	zpool_handle_t *zph;

	len = strcspn(zhp->zfs_name, "/@#") + 1;
	pool_name = zfs_alloc(zhp->zfs_hdl, len);
	(void) strlcpy(pool_name, zhp->zfs_name, len);

	zph = zpool_find_handle(zhp, pool_name, len);
	if (zph == NULL)
		zph = zpool_add_handle(zhp, pool_name);

	free(pool_name);
	return (zph);
}

void
zpool_free_handles(libzfs_handle_t *hdl)
{
	zpool_handle_t *next, *zph = hdl->libzfs_pool_handles;

	while (zph != NULL) {
		next = zph->zpool_next;
		zpool_close(zph);
		zph = next;
	}
	hdl->libzfs_pool_handles = NULL;
}

/*
 * Utility function to gather stats (objset and zpl) for the given object.
 */
static int
get_stats_ioctl(zfs_handle_t *zhp, zfs_cmd_t *zc)
{
	libzfs_handle_t *hdl = zhp->zfs_hdl;

	(void) strlcpy(zc->zc_name, zhp->zfs_name, sizeof (zc->zc_name));

	while (ioctl(hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, zc) != 0) {
		if (errno == ENOMEM) {
			if (zcmd_expand_dst_nvlist(hdl, zc) != 0) {
				return (-1);
			}
		} else {
			return (-1);
		}
	}
	return (0);
}

/*
 * Utility function to get the received properties of the given object.
 */
static int
get_recvd_props_ioctl(zfs_handle_t *zhp)
{
	libzfs_handle_t *hdl = zhp->zfs_hdl;
	nvlist_t *recvdprops;
	zfs_cmd_t zc = { 0 };
	int err;

	if (zcmd_alloc_dst_nvlist(hdl, &zc, 0) != 0)
		return (-1);

	(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));

	while (ioctl(hdl->libzfs_fd, ZFS_IOC_OBJSET_RECVD_PROPS, &zc) != 0) {
		if (errno == ENOMEM) {
			if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) {
				return (-1);
			}
		} else {
			zcmd_free_nvlists(&zc);
			return (-1);
		}
	}

	err = zcmd_read_dst_nvlist(zhp->zfs_hdl, &zc, &recvdprops);
	zcmd_free_nvlists(&zc);
	if (err != 0)
		return (-1);

	nvlist_free(zhp->zfs_recvd_props);
	zhp->zfs_recvd_props = recvdprops;

	return (0);
}

static int
put_stats_zhdl(zfs_handle_t *zhp, zfs_cmd_t *zc)
{
	nvlist_t *allprops, *userprops;

	zhp->zfs_dmustats = zc->zc_objset_stats; /* structure assignment */

	if (zcmd_read_dst_nvlist(zhp->zfs_hdl, zc, &allprops) != 0) {
		return (-1);
	}

	/*
	 * XXX Why do we store the user props separately, in addition to
	 * storing them in zfs_props?
	 */
	if ((userprops = process_user_props(zhp, allprops)) == NULL) {
		nvlist_free(allprops);
		return (-1);
	}

	nvlist_free(zhp->zfs_props);
	nvlist_free(zhp->zfs_user_props);

	zhp->zfs_props = allprops;
	zhp->zfs_user_props = userprops;

	return (0);
}

static int
get_stats(zfs_handle_t *zhp)
{
	int rc = 0;
	zfs_cmd_t zc = { 0 };

	if (zcmd_alloc_dst_nvlist(zhp->zfs_hdl, &zc, 0) != 0)
		return (-1);
	if (get_stats_ioctl(zhp, &zc) != 0)
		rc = -1;
	else if (put_stats_zhdl(zhp, &zc) != 0)
		rc = -1;
	zcmd_free_nvlists(&zc);
	return (rc);
}

/*
 * Refresh the properties currently stored in the handle.
 */
void
zfs_refresh_properties(zfs_handle_t *zhp)
{
	(void) get_stats(zhp);
}

/*
 * Makes a handle from the given dataset name.  Used by zfs_open() and
 * zfs_iter_* to create child handles on the fly.
 */
static int
make_dataset_handle_common(zfs_handle_t *zhp, zfs_cmd_t *zc)
{
	if (put_stats_zhdl(zhp, zc) != 0)
		return (-1);

	/*
	 * We've managed to open the dataset and gather statistics.  Determine
	 * the high-level type.
	 */
	if (zhp->zfs_dmustats.dds_type == DMU_OST_ZVOL)
		zhp->zfs_head_type = ZFS_TYPE_VOLUME;
	else if (zhp->zfs_dmustats.dds_type == DMU_OST_ZFS)
		zhp->zfs_head_type = ZFS_TYPE_FILESYSTEM;
	else if (zhp->zfs_dmustats.dds_type == DMU_OST_OTHER)
		return (-1);
	else
		abort();

	if (zhp->zfs_dmustats.dds_is_snapshot)
		zhp->zfs_type = ZFS_TYPE_SNAPSHOT;
	else if (zhp->zfs_dmustats.dds_type == DMU_OST_ZVOL)
		zhp->zfs_type = ZFS_TYPE_VOLUME;
	else if (zhp->zfs_dmustats.dds_type == DMU_OST_ZFS)
		zhp->zfs_type = ZFS_TYPE_FILESYSTEM;
	else
		abort();	/* we should never see any other types */

	if ((zhp->zpool_hdl = zpool_handle(zhp)) == NULL)
		return (-1);

	return (0);
}

zfs_handle_t *
make_dataset_handle(libzfs_handle_t *hdl, const char *path)
{
	zfs_cmd_t zc = { 0 };

	zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);

	if (zhp == NULL)
		return (NULL);

	zhp->zfs_hdl = hdl;
	(void) strlcpy(zhp->zfs_name, path, sizeof (zhp->zfs_name));
	if (zcmd_alloc_dst_nvlist(hdl, &zc, 0) != 0) {
		free(zhp);
		return (NULL);
	}
	if (get_stats_ioctl(zhp, &zc) == -1) {
		zcmd_free_nvlists(&zc);
		free(zhp);
		return (NULL);
	}
	if (make_dataset_handle_common(zhp, &zc) == -1) {
		free(zhp);
		zhp = NULL;
	}
	zcmd_free_nvlists(&zc);
	return (zhp);
}

zfs_handle_t *
make_dataset_handle_zc(libzfs_handle_t *hdl, zfs_cmd_t *zc)
{
	zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);

	if (zhp == NULL)
		return (NULL);

	zhp->zfs_hdl = hdl;
	(void) strlcpy(zhp->zfs_name, zc->zc_name, sizeof (zhp->zfs_name));
	if (make_dataset_handle_common(zhp, zc) == -1) {
		free(zhp);
		return (NULL);
	}
	return (zhp);
}

zfs_handle_t *
make_dataset_simple_handle_zc(zfs_handle_t *pzhp, zfs_cmd_t *zc)
{
	zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);

	if (zhp == NULL)
		return (NULL);

	zhp->zfs_hdl = pzhp->zfs_hdl;
	(void) strlcpy(zhp->zfs_name, zc->zc_name, sizeof (zhp->zfs_name));
	zhp->zfs_head_type = pzhp->zfs_type;
	zhp->zfs_type = ZFS_TYPE_SNAPSHOT;
	zhp->zpool_hdl = zpool_handle(zhp);
	return (zhp);
}

zfs_handle_t *
zfs_handle_dup(zfs_handle_t *zhp_orig)
{
	zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);

	if (zhp == NULL)
		return (NULL);

	zhp->zfs_hdl = zhp_orig->zfs_hdl;
	zhp->zpool_hdl = zhp_orig->zpool_hdl;
	(void) strlcpy(zhp->zfs_name, zhp_orig->zfs_name,
	    sizeof (zhp->zfs_name));
	zhp->zfs_type = zhp_orig->zfs_type;
	zhp->zfs_head_type = zhp_orig->zfs_head_type;
	zhp->zfs_dmustats = zhp_orig->zfs_dmustats;
	if (zhp_orig->zfs_props != NULL) {
		if (nvlist_dup(zhp_orig->zfs_props, &zhp->zfs_props, 0) != 0) {
			(void) no_memory(zhp->zfs_hdl);
			zfs_close(zhp);
			return (NULL);
		}
	}
	if (zhp_orig->zfs_user_props != NULL) {
		if (nvlist_dup(zhp_orig->zfs_user_props,
		    &zhp->zfs_user_props, 0) != 0) {
			(void) no_memory(zhp->zfs_hdl);
			zfs_close(zhp);
			return (NULL);
		}
	}
	if (zhp_orig->zfs_recvd_props != NULL) {
		if (nvlist_dup(zhp_orig->zfs_recvd_props,
		    &zhp->zfs_recvd_props, 0)) {
			(void) no_memory(zhp->zfs_hdl);
			zfs_close(zhp);
			return (NULL);
		}
	}
	zhp->zfs_mntcheck = zhp_orig->zfs_mntcheck;
	if (zhp_orig->zfs_mntopts != NULL) {
		zhp->zfs_mntopts = zfs_strdup(zhp_orig->zfs_hdl,
		    zhp_orig->zfs_mntopts);
	}
	zhp->zfs_props_table = zhp_orig->zfs_props_table;
	return (zhp);
}

boolean_t
zfs_bookmark_exists(const char *path)
{
	nvlist_t *bmarks;
	nvlist_t *props;
	char fsname[ZFS_MAX_DATASET_NAME_LEN];
	char *bmark_name;
	char *pound;
	int err;
	boolean_t rv;


	(void) strlcpy(fsname, path, sizeof (fsname));
	pound = strchr(fsname, '#');
	if (pound == NULL)
		return (B_FALSE);

	*pound = '\0';
	bmark_name = pound + 1;
	props = fnvlist_alloc();
	err = lzc_get_bookmarks(fsname, props, &bmarks);
	nvlist_free(props);
	if (err != 0) {
		nvlist_free(bmarks);
		return (B_FALSE);
	}

	rv = nvlist_exists(bmarks, bmark_name);
	nvlist_free(bmarks);
	return (rv);
}

zfs_handle_t *
make_bookmark_handle(zfs_handle_t *parent, const char *path,
    nvlist_t *bmark_props)
{
	zfs_handle_t *zhp = calloc(sizeof (zfs_handle_t), 1);

	if (zhp == NULL)
		return (NULL);

	/* Fill in the name. */
	zhp->zfs_hdl = parent->zfs_hdl;
	(void) strlcpy(zhp->zfs_name, path, sizeof (zhp->zfs_name));

	/* Set the property lists. */
	if (nvlist_dup(bmark_props, &zhp->zfs_props, 0) != 0) {
		free(zhp);
		return (NULL);
	}

	/* Set the types. */
	zhp->zfs_head_type = parent->zfs_head_type;
	zhp->zfs_type = ZFS_TYPE_BOOKMARK;

	if ((zhp->zpool_hdl = zpool_handle(zhp)) == NULL) {
		nvlist_free(zhp->zfs_props);
		free(zhp);
		return (NULL);
	}

	return (zhp);
}

struct zfs_open_bookmarks_cb_data {
	const char *path;
	zfs_handle_t *zhp;
};

static int
zfs_open_bookmarks_cb(zfs_handle_t *zhp, void *data)
{
	struct zfs_open_bookmarks_cb_data *dp = data;

	/*
	 * Is it the one we are looking for?
	 */
	if (strcmp(dp->path, zfs_get_name(zhp)) == 0) {
		/*
		 * We found it.  Save it and let the caller know we are done.
		 */
		dp->zhp = zhp;
		return (EEXIST);
	}

	/*
	 * Not found.  Close the handle and ask for another one.
	 */
	zfs_close(zhp);
	return (0);
}

/*
 * Opens the given snapshot, bookmark, filesystem, or volume.   The 'types'
 * argument is a mask of acceptable types.  The function will print an
 * appropriate error message and return NULL if it can't be opened.
 */
zfs_handle_t *
zfs_open(libzfs_handle_t *hdl, const char *path, int types)
{
	zfs_handle_t *zhp;
	char errbuf[1024];
	char *bookp;

	(void) snprintf(errbuf, sizeof (errbuf),
	    dgettext(TEXT_DOMAIN, "cannot open '%s'"), path);

	/*
	 * Validate the name before we even try to open it.
	 */
	if (!zfs_validate_name(hdl, path, types, B_FALSE)) {
		(void) zfs_error(hdl, EZFS_INVALIDNAME, errbuf);
		return (NULL);
	}

	/*
	 * Bookmarks needs to be handled separately.
	 */
	bookp = strchr(path, '#');
	if (bookp == NULL) {
		/*
		 * Try to get stats for the dataset, which will tell us if it
		 * exists.
		 */
		errno = 0;
		if ((zhp = make_dataset_handle(hdl, path)) == NULL) {
			(void) zfs_standard_error(hdl, errno, errbuf);
			return (NULL);
		}
	} else {
		char dsname[ZFS_MAX_DATASET_NAME_LEN];
		zfs_handle_t *pzhp;
		struct zfs_open_bookmarks_cb_data cb_data = {path, NULL};

		/*
		 * We need to cut out '#' and everything after '#'
		 * to get the parent dataset name only.
		 */
		assert(bookp - path < sizeof (dsname));
		(void) strncpy(dsname, path, bookp - path);
		dsname[bookp - path] = '\0';

		/*
		 * Create handle for the parent dataset.
		 */
		errno = 0;
		if ((pzhp = make_dataset_handle(hdl, dsname)) == NULL) {
			(void) zfs_standard_error(hdl, errno, errbuf);
			return (NULL);
		}

		/*
		 * Iterate bookmarks to find the right one.
		 */
		errno = 0;
		if ((zfs_iter_bookmarks(pzhp, zfs_open_bookmarks_cb,
		    &cb_data) == 0) && (cb_data.zhp == NULL)) {
			(void) zfs_error(hdl, EZFS_NOENT, errbuf);
			zfs_close(pzhp);
			return (NULL);
		}
		if (cb_data.zhp == NULL) {
			(void) zfs_standard_error(hdl, errno, errbuf);
			zfs_close(pzhp);
			return (NULL);
		}
		zhp = cb_data.zhp;

		/*
		 * Cleanup.
		 */
		zfs_close(pzhp);
	}

	if (!(types & zhp->zfs_type)) {
		(void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
		zfs_close(zhp);
		return (NULL);
	}

	return (zhp);
}

/*
 * Release a ZFS handle.  Nothing to do but free the associated memory.
 */
void
zfs_close(zfs_handle_t *zhp)
{
	if (zhp->zfs_mntopts)
		free(zhp->zfs_mntopts);
	nvlist_free(zhp->zfs_props);
	nvlist_free(zhp->zfs_user_props);
	nvlist_free(zhp->zfs_recvd_props);
	free(zhp);
}

typedef struct mnttab_node {
	struct mnttab mtn_mt;
	avl_node_t mtn_node;
} mnttab_node_t;

static int
libzfs_mnttab_cache_compare(const void *arg1, const void *arg2)
{
	const mnttab_node_t *mtn1 = (const mnttab_node_t *)arg1;
	const mnttab_node_t *mtn2 = (const mnttab_node_t *)arg2;
	int rv;

	rv = strcmp(mtn1->mtn_mt.mnt_special, mtn2->mtn_mt.mnt_special);

	if (rv == 0)
		return (0);
	return (rv > 0 ? 1 : -1);
}

void
libzfs_mnttab_init(libzfs_handle_t *hdl)
{
	(void) mutex_init(&hdl->libzfs_mnttab_cache_lock,
	    LOCK_NORMAL | LOCK_ERRORCHECK, NULL);
	assert(avl_numnodes(&hdl->libzfs_mnttab_cache) == 0);
	avl_create(&hdl->libzfs_mnttab_cache, libzfs_mnttab_cache_compare,
	    sizeof (mnttab_node_t), offsetof(mnttab_node_t, mtn_node));
}

void
libzfs_mnttab_update(libzfs_handle_t *hdl)
{
	struct mnttab entry;

	rewind(hdl->libzfs_mnttab);
	while (getmntent(hdl->libzfs_mnttab, &entry) == 0) {
		mnttab_node_t *mtn;

		if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
			continue;
		mtn = zfs_alloc(hdl, sizeof (mnttab_node_t));
		mtn->mtn_mt.mnt_special = zfs_strdup(hdl, entry.mnt_special);
		mtn->mtn_mt.mnt_mountp = zfs_strdup(hdl, entry.mnt_mountp);
		mtn->mtn_mt.mnt_fstype = zfs_strdup(hdl, entry.mnt_fstype);
		mtn->mtn_mt.mnt_mntopts = zfs_strdup(hdl, entry.mnt_mntopts);
		avl_add(&hdl->libzfs_mnttab_cache, mtn);
	}
}

void
libzfs_mnttab_fini(libzfs_handle_t *hdl)
{
	void *cookie = NULL;
	mnttab_node_t *mtn;

	while ((mtn = avl_destroy_nodes(&hdl->libzfs_mnttab_cache, &cookie))
	    != NULL) {
		free(mtn->mtn_mt.mnt_special);
		free(mtn->mtn_mt.mnt_mountp);
		free(mtn->mtn_mt.mnt_fstype);
		free(mtn->mtn_mt.mnt_mntopts);
		free(mtn);
	}
	avl_destroy(&hdl->libzfs_mnttab_cache);
	(void) mutex_destroy(&hdl->libzfs_mnttab_cache_lock);
}

void
libzfs_mnttab_cache(libzfs_handle_t *hdl, boolean_t enable)
{
	hdl->libzfs_mnttab_enable = enable;
}

int
libzfs_mnttab_find(libzfs_handle_t *hdl, const char *fsname,
    struct mnttab *entry)
{
	mnttab_node_t find;
	mnttab_node_t *mtn;
	int ret = ENOENT;

	if (!hdl->libzfs_mnttab_enable) {
		struct mnttab srch = { 0 };

		if (avl_numnodes(&hdl->libzfs_mnttab_cache))
			libzfs_mnttab_fini(hdl);
		rewind(hdl->libzfs_mnttab);
		srch.mnt_special = (char *)fsname;
		srch.mnt_fstype = MNTTYPE_ZFS;
		if (getmntany(hdl->libzfs_mnttab, entry, &srch) == 0)
			return (0);
		else
			return (ENOENT);
	}

	mutex_enter(&hdl->libzfs_mnttab_cache_lock);
	if (avl_numnodes(&hdl->libzfs_mnttab_cache) == 0)
		libzfs_mnttab_update(hdl);

	find.mtn_mt.mnt_special = (char *)fsname;
	mtn = avl_find(&hdl->libzfs_mnttab_cache, &find, NULL);
	if (mtn) {
		*entry = mtn->mtn_mt;
		ret = 0;
	}
	mutex_exit(&hdl->libzfs_mnttab_cache_lock);
	return (ret);
}

void
libzfs_mnttab_add(libzfs_handle_t *hdl, const char *special,
    const char *mountp, const char *mntopts)
{
	mnttab_node_t *mtn;

	mutex_enter(&hdl->libzfs_mnttab_cache_lock);
	if (avl_numnodes(&hdl->libzfs_mnttab_cache) != 0) {
		mtn = zfs_alloc(hdl, sizeof (mnttab_node_t));
		mtn->mtn_mt.mnt_special = zfs_strdup(hdl, special);
		mtn->mtn_mt.mnt_mountp = zfs_strdup(hdl, mountp);
		mtn->mtn_mt.mnt_fstype = zfs_strdup(hdl, MNTTYPE_ZFS);
		mtn->mtn_mt.mnt_mntopts = zfs_strdup(hdl, mntopts);
		avl_add(&hdl->libzfs_mnttab_cache, mtn);
	}
	mutex_exit(&hdl->libzfs_mnttab_cache_lock);
}

void
libzfs_mnttab_remove(libzfs_handle_t *hdl, const char *fsname)
{
	mnttab_node_t find;
	mnttab_node_t *ret;

	mutex_enter(&hdl->libzfs_mnttab_cache_lock);
	find.mtn_mt.mnt_special = (char *)fsname;
	if ((ret = avl_find(&hdl->libzfs_mnttab_cache, (void *)&find, NULL))
	    != NULL) {
		avl_remove(&hdl->libzfs_mnttab_cache, ret);
		free(ret->mtn_mt.mnt_special);
		free(ret->mtn_mt.mnt_mountp);
		free(ret->mtn_mt.mnt_fstype);
		free(ret->mtn_mt.mnt_mntopts);
		free(ret);
	}
	mutex_exit(&hdl->libzfs_mnttab_cache_lock);
}

int
zfs_spa_version(zfs_handle_t *zhp, int *spa_version)
{
	zpool_handle_t *zpool_handle = zhp->zpool_hdl;

	if (zpool_handle == NULL)
		return (-1);

	*spa_version = zpool_get_prop_int(zpool_handle,
	    ZPOOL_PROP_VERSION, NULL);
	return (0);
}

/*
 * The choice of reservation property depends on the SPA version.
 */
static int
zfs_which_resv_prop(zfs_handle_t *zhp, zfs_prop_t *resv_prop)
{
	int spa_version;

	if (zfs_spa_version(zhp, &spa_version) < 0)
		return (-1);

	if (spa_version >= SPA_VERSION_REFRESERVATION)
		*resv_prop = ZFS_PROP_REFRESERVATION;
	else
		*resv_prop = ZFS_PROP_RESERVATION;

	return (0);
}

/*
 * Given an nvlist of properties to set, validates that they are correct, and
 * parses any numeric properties (index, boolean, etc) if they are specified as
 * strings.
 */
nvlist_t *
zfs_valid_proplist(libzfs_handle_t *hdl, zfs_type_t type, nvlist_t *nvl,
    uint64_t zoned, zfs_handle_t *zhp, zpool_handle_t *zpool_hdl,
    boolean_t key_params_ok, const char *errbuf)
{
	nvpair_t *elem;
	uint64_t intval;
	char *strval;
	zfs_prop_t prop;
	nvlist_t *ret;
	int chosen_normal = -1;
	int chosen_utf = -1;

	if (nvlist_alloc(&ret, NV_UNIQUE_NAME, 0) != 0) {
		(void) no_memory(hdl);
		return (NULL);
	}

	/*
	 * Make sure this property is valid and applies to this type.
	 */

	elem = NULL;
	while ((elem = nvlist_next_nvpair(nvl, elem)) != NULL) {
		const char *propname = nvpair_name(elem);

		prop = zfs_name_to_prop(propname);
		if (prop == ZPROP_INVAL && zfs_prop_user(propname)) {
			/*
			 * This is a user property: make sure it's a
			 * string, and that it's less than ZAP_MAXNAMELEN.
			 */
			if (nvpair_type(elem) != DATA_TYPE_STRING) {
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "'%s' must be a string"), propname);
				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
				goto error;
			}

			if (strlen(nvpair_name(elem)) >= ZAP_MAXNAMELEN) {
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "property name '%s' is too long"),
				    propname);
				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
				goto error;
			}

			(void) nvpair_value_string(elem, &strval);
			if (nvlist_add_string(ret, propname, strval) != 0) {
				(void) no_memory(hdl);
				goto error;
			}
			continue;
		}

		/*
		 * Currently, only user properties can be modified on
		 * snapshots.
		 */
		if (type == ZFS_TYPE_SNAPSHOT) {
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "this property can not be modified for snapshots"));
			(void) zfs_error(hdl, EZFS_PROPTYPE, errbuf);
			goto error;
		}

		if (prop == ZPROP_INVAL && zfs_prop_userquota(propname)) {
			zfs_userquota_prop_t uqtype;
			char newpropname[128];
			char domain[128];
			uint64_t rid;
			uint64_t valary[3];

			if (userquota_propname_decode(propname, zoned,
			    &uqtype, domain, sizeof (domain), &rid) != 0) {
				zfs_error_aux(hdl,
				    dgettext(TEXT_DOMAIN,
				    "'%s' has an invalid user/group name"),
				    propname);
				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
				goto error;
			}

			if (uqtype != ZFS_PROP_USERQUOTA &&
			    uqtype != ZFS_PROP_GROUPQUOTA &&
			    uqtype != ZFS_PROP_USEROBJQUOTA &&
			    uqtype != ZFS_PROP_GROUPOBJQUOTA &&
			    uqtype != ZFS_PROP_PROJECTQUOTA &&
			    uqtype != ZFS_PROP_PROJECTOBJQUOTA) {
				zfs_error_aux(hdl,
				    dgettext(TEXT_DOMAIN, "'%s' is readonly"),
				    propname);
				(void) zfs_error(hdl, EZFS_PROPREADONLY,
				    errbuf);
				goto error;
			}

			if (nvpair_type(elem) == DATA_TYPE_STRING) {
				(void) nvpair_value_string(elem, &strval);
				if (strcmp(strval, "none") == 0) {
					intval = 0;
				} else if (zfs_nicestrtonum(hdl,
				    strval, &intval) != 0) {
					(void) zfs_error(hdl,
					    EZFS_BADPROP, errbuf);
					goto error;
				}
			} else if (nvpair_type(elem) ==
			    DATA_TYPE_UINT64) {
				(void) nvpair_value_uint64(elem, &intval);
				if (intval == 0) {
					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
					    "use 'none' to disable "
					    "{user|group|project}quota"));
					goto error;
				}
			} else {
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "'%s' must be a number"), propname);
				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
				goto error;
			}

			/*
			 * Encode the prop name as
			 * userquota@<hex-rid>-domain, to make it easy
			 * for the kernel to decode.
			 */
			(void) snprintf(newpropname, sizeof (newpropname),
			    "%s%llx-%s", zfs_userquota_prop_prefixes[uqtype],
			    (longlong_t)rid, domain);
			valary[0] = uqtype;
			valary[1] = rid;
			valary[2] = intval;
			if (nvlist_add_uint64_array(ret, newpropname,
			    valary, 3) != 0) {
				(void) no_memory(hdl);
				goto error;
			}
			continue;
		} else if (prop == ZPROP_INVAL && zfs_prop_written(propname)) {
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "'%s' is readonly"),
			    propname);
			(void) zfs_error(hdl, EZFS_PROPREADONLY, errbuf);
			goto error;
		}

		if (prop == ZPROP_INVAL) {
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "invalid property '%s'"), propname);
			(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
			goto error;
		}

		if (!zfs_prop_valid_for_type(prop, type)) {
			zfs_error_aux(hdl,
			    dgettext(TEXT_DOMAIN, "'%s' does not "
			    "apply to datasets of this type"), propname);
			(void) zfs_error(hdl, EZFS_PROPTYPE, errbuf);
			goto error;
		}

		if (zfs_prop_readonly(prop) &&
		    !(zfs_prop_setonce(prop) && zhp == NULL) &&
		    !(zfs_prop_encryption_key_param(prop) && key_params_ok)) {
			zfs_error_aux(hdl,
			    dgettext(TEXT_DOMAIN, "'%s' is readonly"),
			    propname);
			(void) zfs_error(hdl, EZFS_PROPREADONLY, errbuf);
			goto error;
		}

		if (zprop_parse_value(hdl, elem, prop, type, ret,
		    &strval, &intval, errbuf) != 0)
			goto error;

		/*
		 * Perform some additional checks for specific properties.
		 */
		switch (prop) {
		case ZFS_PROP_VERSION:
		{
			int version;

			if (zhp == NULL)
				break;
			version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
			if (intval < version) {
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "Can not downgrade; already at version %u"),
				    version);
				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
				goto error;
			}
			break;
		}

		case ZFS_PROP_VOLBLOCKSIZE:
		case ZFS_PROP_RECORDSIZE:
		{
			int maxbs = SPA_MAXBLOCKSIZE;
			if (zpool_hdl != NULL) {
				maxbs = zpool_get_prop_int(zpool_hdl,
				    ZPOOL_PROP_MAXBLOCKSIZE, NULL);
			}
			/*
			 * Volumes are limited to a volblocksize of 128KB,
			 * because they typically service workloads with
			 * small random writes, which incur a large performance
			 * penalty with large blocks.
			 */
			if (prop == ZFS_PROP_VOLBLOCKSIZE)
				maxbs = SPA_OLD_MAXBLOCKSIZE;
			/*
			 * The value must be a power of two between
			 * SPA_MINBLOCKSIZE and maxbs.
			 */
			if (intval < SPA_MINBLOCKSIZE ||
			    intval > maxbs || !ISP2(intval)) {
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "'%s' must be power of 2 from 512B "
				    "to %uKB"), propname, maxbs >> 10);
				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
				goto error;
			}
			break;
		}

		case ZFS_PROP_SPECIAL_SMALL_BLOCKS:
			if (zpool_hdl != NULL) {
				char state[64] = "";

				/*
				 * Issue a warning but do not fail so that
				 * tests for setable properties succeed.
				 */
				if (zpool_prop_get_feature(zpool_hdl,
				    "feature@allocation_classes", state,
				    sizeof (state)) != 0 ||
				    strcmp(state, ZFS_FEATURE_ACTIVE) != 0) {
					(void) fprintf(stderr, gettext(
					    "%s: property requires a special "
					    "device in the pool\n"), propname);
				}
			}
			if (intval != 0 &&
			    (intval < SPA_MINBLOCKSIZE ||
			    intval > SPA_OLD_MAXBLOCKSIZE || !ISP2(intval))) {
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "invalid '%s=%d' property: must be zero or "
				    "a power of 2 from 512B to 128K"), propname,
				    intval);
				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
				goto error;
			}
			break;

		case ZFS_PROP_MLSLABEL:
		{
			/*
			 * Verify the mlslabel string and convert to
			 * internal hex label string.
			 */

			m_label_t *new_sl;
			char *hex = NULL;	/* internal label string */

			/* Default value is already OK. */
			if (strcasecmp(strval, ZFS_MLSLABEL_DEFAULT) == 0)
				break;

			/* Verify the label can be converted to binary form */
			if (((new_sl = m_label_alloc(MAC_LABEL)) == NULL) ||
			    (str_to_label(strval, &new_sl, MAC_LABEL,
			    L_NO_CORRECTION, NULL) == -1)) {
				goto badlabel;
			}

			/* Now translate to hex internal label string */
			if (label_to_str(new_sl, &hex, M_INTERNAL,
			    DEF_NAMES) != 0) {
				if (hex)
					free(hex);
				goto badlabel;
			}
			m_label_free(new_sl);

			/* If string is already in internal form, we're done. */
			if (strcmp(strval, hex) == 0) {
				free(hex);
				break;
			}

			/* Replace the label string with the internal form. */
			(void) nvlist_remove(ret, zfs_prop_to_name(prop),
			    DATA_TYPE_STRING);
			verify(nvlist_add_string(ret, zfs_prop_to_name(prop),
			    hex) == 0);
			free(hex);

			break;

badlabel:
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "invalid mlslabel '%s'"), strval);
			(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
			m_label_free(new_sl);	/* OK if null */
			goto error;

		}

		case ZFS_PROP_MOUNTPOINT:
		{
			namecheck_err_t why;

			if (strcmp(strval, ZFS_MOUNTPOINT_NONE) == 0 ||
			    strcmp(strval, ZFS_MOUNTPOINT_LEGACY) == 0)
				break;

			if (mountpoint_namecheck(strval, &why)) {
				switch (why) {
				case NAME_ERR_LEADING_SLASH:
					zfs_error_aux(hdl,
					    dgettext(TEXT_DOMAIN,
					    "'%s' must be an absolute path, "
					    "'none', or 'legacy'"), propname);
					break;
				case NAME_ERR_TOOLONG:
					zfs_error_aux(hdl,
					    dgettext(TEXT_DOMAIN,
					    "component of '%s' is too long"),
					    propname);
					break;

				default:
					zfs_error_aux(hdl,
					    dgettext(TEXT_DOMAIN,
					    "(%d) not defined"),
					    why);
					break;
				}
				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
				goto error;
			}
		}

			/*FALLTHRU*/

		case ZFS_PROP_SHARESMB:
		case ZFS_PROP_SHARENFS:
			/*
			 * For the mountpoint and sharenfs or sharesmb
			 * properties, check if it can be set in a
			 * global/non-global zone based on
			 * the zoned property value:
			 *
			 *		global zone	    non-global zone
			 * --------------------------------------------------
			 * zoned=on	mountpoint (no)	    mountpoint (yes)
			 *		sharenfs (no)	    sharenfs (yes)
			 *		sharesmb (no)	    sharesmb (yes)
			 *
			 * zoned=off	mountpoint (yes)	N/A
			 *		sharenfs (yes)
			 *		sharesmb (yes)
			 */
			if (zoned) {
				if (getzoneid() == GLOBAL_ZONEID) {
					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
					    "'%s' cannot be set on "
					    "dataset in a non-global zone"),
					    propname);
					(void) zfs_error(hdl, EZFS_ZONED,
					    errbuf);
					goto error;
				}
			} else if (getzoneid() != GLOBAL_ZONEID) {
				/*
				 * If zoned property is 'off', this must be in
				 * a global zone. If not, something is wrong.
				 */
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "'%s' cannot be set while dataset "
				    "'zoned' property is set"), propname);
				(void) zfs_error(hdl, EZFS_ZONED, errbuf);
				goto error;
			}

			/*
			 * At this point, it is legitimate to set the
			 * property. Now we want to make sure that the
			 * property value is valid if it is sharenfs.
			 */
			if ((prop == ZFS_PROP_SHARENFS ||
			    prop == ZFS_PROP_SHARESMB) &&
			    strcmp(strval, "on") != 0 &&
			    strcmp(strval, "off") != 0) {
				zfs_share_proto_t proto;

				if (prop == ZFS_PROP_SHARESMB)
					proto = PROTO_SMB;
				else
					proto = PROTO_NFS;

				/*
				 * Must be an valid sharing protocol
				 * option string so init the libshare
				 * in order to enable the parser and
				 * then parse the options. We use the
				 * control API since we don't care about
				 * the current configuration and don't
				 * want the overhead of loading it
				 * until we actually do something.
				 */

				if (zfs_init_libshare(hdl,
				    SA_INIT_CONTROL_API) != SA_OK) {
					/*
					 * An error occurred so we can't do
					 * anything
					 */
					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
					    "'%s' cannot be set: problem "
					    "in share initialization"),
					    propname);
					(void) zfs_error(hdl, EZFS_BADPROP,
					    errbuf);
					goto error;
				}

				if (zfs_parse_options(strval, proto) != SA_OK) {
					/*
					 * There was an error in parsing so
					 * deal with it by issuing an error
					 * message and leaving after
					 * uninitializing the the libshare
					 * interface.
					 */
					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
					    "'%s' cannot be set to invalid "
					    "options"), propname);
					(void) zfs_error(hdl, EZFS_BADPROP,
					    errbuf);
					zfs_uninit_libshare(hdl);
					goto error;
				}
				zfs_uninit_libshare(hdl);
			}

			break;

		case ZFS_PROP_KEYLOCATION:
			if (!zfs_prop_valid_keylocation(strval, B_FALSE)) {
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "invalid keylocation"));
				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
				goto error;
			}

			if (zhp != NULL) {
				uint64_t crypt =
				    zfs_prop_get_int(zhp, ZFS_PROP_ENCRYPTION);

				if (crypt == ZIO_CRYPT_OFF &&
				    strcmp(strval, "none") != 0) {
					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
					    "keylocation must be 'none' "
					    "for unencrypted datasets"));
					(void) zfs_error(hdl, EZFS_BADPROP,
					    errbuf);
					goto error;
				} else if (crypt != ZIO_CRYPT_OFF &&
				    strcmp(strval, "none") == 0) {
					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
					    "keylocation must not be 'none' "
					    "for encrypted datasets"));
					(void) zfs_error(hdl, EZFS_BADPROP,
					    errbuf);
					goto error;
				}
			}
			break;

		case ZFS_PROP_PBKDF2_ITERS:
			if (intval < MIN_PBKDF2_ITERATIONS) {
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "minimum pbkdf2 iterations is %u"),
				    MIN_PBKDF2_ITERATIONS);
				(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
				goto error;
			}
			break;

		case ZFS_PROP_UTF8ONLY:
			chosen_utf = (int)intval;
			break;

		case ZFS_PROP_NORMALIZE:
			chosen_normal = (int)intval;
			break;

		default:
			break;
		}

		/*
		 * For changes to existing volumes, we have some additional
		 * checks to enforce.
		 */
		if (type == ZFS_TYPE_VOLUME && zhp != NULL) {
			uint64_t volsize = zfs_prop_get_int(zhp,
			    ZFS_PROP_VOLSIZE);
			uint64_t blocksize = zfs_prop_get_int(zhp,
			    ZFS_PROP_VOLBLOCKSIZE);
			char buf[64];

			switch (prop) {
			case ZFS_PROP_RESERVATION:
				if (intval > volsize) {
					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
					    "'%s' is greater than current "
					    "volume size"), propname);
					(void) zfs_error(hdl, EZFS_BADPROP,
					    errbuf);
					goto error;
				}
				break;

			case ZFS_PROP_REFRESERVATION:
				if (intval > volsize && intval != UINT64_MAX) {
					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
					    "'%s' is greater than current "
					    "volume size"), propname);
					(void) zfs_error(hdl, EZFS_BADPROP,
					    errbuf);
					goto error;
				}
				break;

			case ZFS_PROP_VOLSIZE:
				if (intval % blocksize != 0) {
					zfs_nicenum(blocksize, buf,
					    sizeof (buf));
					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
					    "'%s' must be a multiple of "
					    "volume block size (%s)"),
					    propname, buf);
					(void) zfs_error(hdl, EZFS_BADPROP,
					    errbuf);
					goto error;
				}

				if (intval == 0) {
					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
					    "'%s' cannot be zero"),
					    propname);
					(void) zfs_error(hdl, EZFS_BADPROP,
					    errbuf);
					goto error;
				}
				break;

			default:
				break;
			}
		}

		/* check encryption properties */
		if (zhp != NULL) {
			int64_t crypt = zfs_prop_get_int(zhp,
			    ZFS_PROP_ENCRYPTION);

			switch (prop) {
			case ZFS_PROP_COPIES:
				if (crypt != ZIO_CRYPT_OFF && intval > 2) {
					zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
					    "encrypted datasets cannot have "
					    "3 copies"));
					(void) zfs_error(hdl, EZFS_BADPROP,
					    errbuf);
					goto error;
				}
				break;
			default:
				break;
			}
		}
	}

	/*
	 * If normalization was chosen, but no UTF8 choice was made,
	 * enforce rejection of non-UTF8 names.
	 *
	 * If normalization was chosen, but rejecting non-UTF8 names
	 * was explicitly not chosen, it is an error.
	 */
	if (chosen_normal > 0 && chosen_utf < 0) {
		if (nvlist_add_uint64(ret,
		    zfs_prop_to_name(ZFS_PROP_UTF8ONLY), 1) != 0) {
			(void) no_memory(hdl);
			goto error;
		}
	} else if (chosen_normal > 0 && chosen_utf == 0) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "'%s' must be set 'on' if normalization chosen"),
		    zfs_prop_to_name(ZFS_PROP_UTF8ONLY));
		(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
		goto error;
	}
	return (ret);

error:
	nvlist_free(ret);
	return (NULL);
}

int
zfs_add_synthetic_resv(zfs_handle_t *zhp, nvlist_t *nvl)
{
	uint64_t old_volsize;
	uint64_t new_volsize;
	uint64_t old_reservation;
	uint64_t new_reservation;
	zfs_prop_t resv_prop;
	nvlist_t *props;
	zpool_handle_t *zph = zpool_handle(zhp);

	/*
	 * If this is an existing volume, and someone is setting the volsize,
	 * make sure that it matches the reservation, or add it if necessary.
	 */
	old_volsize = zfs_prop_get_int(zhp, ZFS_PROP_VOLSIZE);
	if (zfs_which_resv_prop(zhp, &resv_prop) < 0)
		return (-1);
	old_reservation = zfs_prop_get_int(zhp, resv_prop);

	props = fnvlist_alloc();
	fnvlist_add_uint64(props, zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
	    zfs_prop_get_int(zhp, ZFS_PROP_VOLBLOCKSIZE));

	if ((zvol_volsize_to_reservation(zph, old_volsize, props) !=
	    old_reservation) || nvlist_exists(nvl,
	    zfs_prop_to_name(resv_prop))) {
		fnvlist_free(props);
		return (0);
	}
	if (nvlist_lookup_uint64(nvl, zfs_prop_to_name(ZFS_PROP_VOLSIZE),
	    &new_volsize) != 0) {
		fnvlist_free(props);
		return (-1);
	}
	new_reservation = zvol_volsize_to_reservation(zph, new_volsize, props);
	fnvlist_free(props);

	if (nvlist_add_uint64(nvl, zfs_prop_to_name(resv_prop),
	    new_reservation) != 0) {
		(void) no_memory(zhp->zfs_hdl);
		return (-1);
	}
	return (1);
}

/*
 * Helper for 'zfs {set|clone} refreservation=auto'.  Must be called after
 * zfs_valid_proplist(), as it is what sets the UINT64_MAX sentinal value.
 * Return codes must match zfs_add_synthetic_resv().
 */
static int
zfs_fix_auto_resv(zfs_handle_t *zhp, nvlist_t *nvl)
{
	uint64_t volsize;
	uint64_t resvsize;
	zfs_prop_t prop;
	nvlist_t *props;

	if (!ZFS_IS_VOLUME(zhp)) {
		return (0);
	}

	if (zfs_which_resv_prop(zhp, &prop) != 0) {
		return (-1);
	}

	if (prop != ZFS_PROP_REFRESERVATION) {
		return (0);
	}

	if (nvlist_lookup_uint64(nvl, zfs_prop_to_name(prop), &resvsize) != 0) {
		/* No value being set, so it can't be "auto" */
		return (0);
	}
	if (resvsize != UINT64_MAX) {
		/* Being set to a value other than "auto" */
		return (0);
	}

	props = fnvlist_alloc();

	fnvlist_add_uint64(props, zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
	    zfs_prop_get_int(zhp, ZFS_PROP_VOLBLOCKSIZE));

	if (nvlist_lookup_uint64(nvl, zfs_prop_to_name(ZFS_PROP_VOLSIZE),
	    &volsize) != 0) {
		volsize = zfs_prop_get_int(zhp, ZFS_PROP_VOLSIZE);
	}

	resvsize = zvol_volsize_to_reservation(zpool_handle(zhp), volsize,
	    props);
	fnvlist_free(props);

	(void) nvlist_remove_all(nvl, zfs_prop_to_name(prop));
	if (nvlist_add_uint64(nvl, zfs_prop_to_name(prop), resvsize) != 0) {
		(void) no_memory(zhp->zfs_hdl);
		return (-1);
	}
	return (1);
}

void
zfs_setprop_error(libzfs_handle_t *hdl, zfs_prop_t prop, int err,
    char *errbuf)
{
	switch (err) {

	case ENOSPC:
		/*
		 * For quotas and reservations, ENOSPC indicates
		 * something different; setting a quota or reservation
		 * doesn't use any disk space.
		 */
		switch (prop) {
		case ZFS_PROP_QUOTA:
		case ZFS_PROP_REFQUOTA:
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "size is less than current used or "
			    "reserved space"));
			(void) zfs_error(hdl, EZFS_PROPSPACE, errbuf);
			break;

		case ZFS_PROP_RESERVATION:
		case ZFS_PROP_REFRESERVATION:
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "size is greater than available space"));
			(void) zfs_error(hdl, EZFS_PROPSPACE, errbuf);
			break;

		default:
			(void) zfs_standard_error(hdl, err, errbuf);
			break;
		}
		break;

	case EBUSY:
		(void) zfs_standard_error(hdl, EBUSY, errbuf);
		break;

	case EROFS:
		(void) zfs_error(hdl, EZFS_DSREADONLY, errbuf);
		break;

	case E2BIG:
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "property value too long"));
		(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
		break;

	case ENOTSUP:
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "pool and or dataset must be upgraded to set this "
		    "property or value"));
		(void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
		break;

	case ERANGE:
		if (prop == ZFS_PROP_COMPRESSION ||
		    prop == ZFS_PROP_RECORDSIZE) {
			(void) zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "property setting is not allowed on "
			    "bootable datasets"));
			(void) zfs_error(hdl, EZFS_NOTSUP, errbuf);
		} else if (prop == ZFS_PROP_CHECKSUM ||
		    prop == ZFS_PROP_DEDUP) {
			(void) zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "property setting is not allowed on "
			    "root pools"));
			(void) zfs_error(hdl, EZFS_NOTSUP, errbuf);
		} else {
			(void) zfs_standard_error(hdl, err, errbuf);
		}
		break;

	case EINVAL:
		if (prop == ZPROP_INVAL) {
			(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
		} else {
			(void) zfs_standard_error(hdl, err, errbuf);
		}
		break;

	case EACCES:
		if (prop == ZFS_PROP_KEYLOCATION) {
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "keylocation may only be set on encryption roots"));
			(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
		} else {
			(void) zfs_standard_error(hdl, err, errbuf);
		}
		break;

	case EOVERFLOW:
		/*
		 * This platform can't address a volume this big.
		 */
#ifdef _ILP32
		if (prop == ZFS_PROP_VOLSIZE) {
			(void) zfs_error(hdl, EZFS_VOLTOOBIG, errbuf);
			break;
		}
#endif
		/* FALLTHROUGH */
	default:
		(void) zfs_standard_error(hdl, err, errbuf);
	}
}

/*
 * Given a property name and value, set the property for the given dataset.
 */
int
zfs_prop_set(zfs_handle_t *zhp, const char *propname, const char *propval)
{
	int ret = -1;
	char errbuf[1024];
	libzfs_handle_t *hdl = zhp->zfs_hdl;
	nvlist_t *nvl = NULL;

	(void) snprintf(errbuf, sizeof (errbuf),
	    dgettext(TEXT_DOMAIN, "cannot set property for '%s'"),
	    zhp->zfs_name);

	if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0 ||
	    nvlist_add_string(nvl, propname, propval) != 0) {
		(void) no_memory(hdl);
		goto error;
	}

	ret = zfs_prop_set_list(zhp, nvl);

error:
	nvlist_free(nvl);
	return (ret);
}



/*
 * Given an nvlist of property names and values, set the properties for the
 * given dataset.
 */
int
zfs_prop_set_list(zfs_handle_t *zhp, nvlist_t *props)
{
	zfs_cmd_t zc = { 0 };
	int ret = -1;
	prop_changelist_t **cls = NULL;
	int cl_idx;
	char errbuf[1024];
	libzfs_handle_t *hdl = zhp->zfs_hdl;
	nvlist_t *nvl;
	int nvl_len;
	int added_resv = 0;

	(void) snprintf(errbuf, sizeof (errbuf),
	    dgettext(TEXT_DOMAIN, "cannot set property for '%s'"),
	    zhp->zfs_name);

	if ((nvl = zfs_valid_proplist(hdl, zhp->zfs_type, props,
	    zfs_prop_get_int(zhp, ZFS_PROP_ZONED), zhp, zhp->zpool_hdl,
	    B_FALSE, errbuf)) == NULL)
		goto error;

	/*
	 * We have to check for any extra properties which need to be added
	 * before computing the length of the nvlist.
	 */
	for (nvpair_t *elem = nvlist_next_nvpair(nvl, NULL);
	    elem != NULL;
	    elem = nvlist_next_nvpair(nvl, elem)) {
		if (zfs_name_to_prop(nvpair_name(elem)) == ZFS_PROP_VOLSIZE &&
		    (added_resv = zfs_add_synthetic_resv(zhp, nvl)) == -1) {
			goto error;
		}
	}

	if (added_resv != 1 &&
	    (added_resv = zfs_fix_auto_resv(zhp, nvl)) == -1) {
		goto error;
	}

	/*
	 * Check how many properties we're setting and allocate an array to
	 * store changelist pointers for postfix().
	 */
	nvl_len = 0;
	for (nvpair_t *elem = nvlist_next_nvpair(nvl, NULL);
	    elem != NULL;
	    elem = nvlist_next_nvpair(nvl, elem))
		nvl_len++;
	if ((cls = calloc(nvl_len, sizeof (prop_changelist_t *))) == NULL)
		goto error;

	cl_idx = 0;
	for (nvpair_t *elem = nvlist_next_nvpair(nvl, NULL);
	    elem != NULL;
	    elem = nvlist_next_nvpair(nvl, elem)) {

		zfs_prop_t prop = zfs_name_to_prop(nvpair_name(elem));

		assert(cl_idx < nvl_len);
		/*
		 * We don't want to unmount & remount the dataset when changing
		 * its canmount property to 'on' or 'noauto'.  We only use
		 * the changelist logic to unmount when setting canmount=off.
		 */
		if (prop != ZFS_PROP_CANMOUNT ||
		    (fnvpair_value_uint64(elem) == ZFS_CANMOUNT_OFF &&
		    zfs_is_mounted(zhp, NULL))) {
			cls[cl_idx] = changelist_gather(zhp, prop, 0, 0);
			if (cls[cl_idx] == NULL)
				goto error;
		}

		if (prop == ZFS_PROP_MOUNTPOINT &&
		    changelist_haszonedchild(cls[cl_idx])) {
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "child dataset with inherited mountpoint is used "
			    "in a non-global zone"));
			ret = zfs_error(hdl, EZFS_ZONED, errbuf);
			goto error;
		}

		if (cls[cl_idx] != NULL &&
		    (ret = changelist_prefix(cls[cl_idx])) != 0)
			goto error;

		cl_idx++;
	}
	assert(cl_idx == nvl_len);

	/*
	 * Execute the corresponding ioctl() to set this list of properties.
	 */
	(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));

	if ((ret = zcmd_write_src_nvlist(hdl, &zc, nvl)) != 0 ||
	    (ret = zcmd_alloc_dst_nvlist(hdl, &zc, 0)) != 0)
		goto error;

	ret = zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc);

	if (ret != 0) {
		if (zc.zc_nvlist_dst_filled == B_FALSE) {
			(void) zfs_standard_error(hdl, errno, errbuf);
			goto error;
		}

		/* Get the list of unset properties back and report them. */
		nvlist_t *errorprops = NULL;
		if (zcmd_read_dst_nvlist(hdl, &zc, &errorprops) != 0)
			goto error;
		for (nvpair_t *elem = nvlist_next_nvpair(errorprops, NULL);
		    elem != NULL;
		    elem = nvlist_next_nvpair(errorprops, elem)) {
			zfs_prop_t prop = zfs_name_to_prop(nvpair_name(elem));
			zfs_setprop_error(hdl, prop, errno, errbuf);
		}
		nvlist_free(errorprops);

		if (added_resv && errno == ENOSPC) {
			/* clean up the volsize property we tried to set */
			uint64_t old_volsize = zfs_prop_get_int(zhp,
			    ZFS_PROP_VOLSIZE);
			nvlist_free(nvl);
			nvl = NULL;
			zcmd_free_nvlists(&zc);

			if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0)
				goto error;
			if (nvlist_add_uint64(nvl,
			    zfs_prop_to_name(ZFS_PROP_VOLSIZE),
			    old_volsize) != 0)
				goto error;
			if (zcmd_write_src_nvlist(hdl, &zc, nvl) != 0)
				goto error;
			(void) zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc);
		}
	} else {
		for (cl_idx = 0; cl_idx < nvl_len; cl_idx++) {
			if (cls[cl_idx] != NULL) {
				int clp_err = changelist_postfix(cls[cl_idx]);
				if (clp_err != 0)
					ret = clp_err;
			}
		}

		/*
		 * Refresh the statistics so the new property value
		 * is reflected.
		 */
		if (ret == 0)
			(void) get_stats(zhp);
	}

error:
	nvlist_free(nvl);
	zcmd_free_nvlists(&zc);
	if (cls != NULL) {
		for (cl_idx = 0; cl_idx < nvl_len; cl_idx++) {
			if (cls[cl_idx] != NULL)
				changelist_free(cls[cl_idx]);
		}
		free(cls);
	}
	return (ret);
}

/*
 * Given a property, inherit the value from the parent dataset, or if received
 * is TRUE, revert to the received value, if any.
 */
int
zfs_prop_inherit(zfs_handle_t *zhp, const char *propname, boolean_t received)
{
	zfs_cmd_t zc = { 0 };
	int ret;
	prop_changelist_t *cl;
	libzfs_handle_t *hdl = zhp->zfs_hdl;
	char errbuf[1024];
	zfs_prop_t prop;

	(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
	    "cannot inherit %s for '%s'"), propname, zhp->zfs_name);

	zc.zc_cookie = received;
	if ((prop = zfs_name_to_prop(propname)) == ZPROP_INVAL) {
		/*
		 * For user properties, the amount of work we have to do is very
		 * small, so just do it here.
		 */
		if (!zfs_prop_user(propname)) {
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "invalid property"));
			return (zfs_error(hdl, EZFS_BADPROP, errbuf));
		}

		(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
		(void) strlcpy(zc.zc_value, propname, sizeof (zc.zc_value));

		if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_INHERIT_PROP, &zc) != 0)
			return (zfs_standard_error(hdl, errno, errbuf));

		return (0);
	}

	/*
	 * Verify that this property is inheritable.
	 */
	if (zfs_prop_readonly(prop))
		return (zfs_error(hdl, EZFS_PROPREADONLY, errbuf));

	if (!zfs_prop_inheritable(prop) && !received)
		return (zfs_error(hdl, EZFS_PROPNONINHERIT, errbuf));

	/*
	 * Check to see if the value applies to this type
	 */
	if (!zfs_prop_valid_for_type(prop, zhp->zfs_type))
		return (zfs_error(hdl, EZFS_PROPTYPE, errbuf));

	/*
	 * Normalize the name, to get rid of shorthand abbreviations.
	 */
	propname = zfs_prop_to_name(prop);
	(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
	(void) strlcpy(zc.zc_value, propname, sizeof (zc.zc_value));

	if (prop == ZFS_PROP_MOUNTPOINT && getzoneid() == GLOBAL_ZONEID &&
	    zfs_prop_get_int(zhp, ZFS_PROP_ZONED)) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "dataset is used in a non-global zone"));
		return (zfs_error(hdl, EZFS_ZONED, errbuf));
	}

	/*
	 * Determine datasets which will be affected by this change, if any.
	 */
	if ((cl = changelist_gather(zhp, prop, 0, 0)) == NULL)
		return (-1);

	if (prop == ZFS_PROP_MOUNTPOINT && changelist_haszonedchild(cl)) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "child dataset with inherited mountpoint is used "
		    "in a non-global zone"));
		ret = zfs_error(hdl, EZFS_ZONED, errbuf);
		goto error;
	}

	if ((ret = changelist_prefix(cl)) != 0)
		goto error;

	if ((ret = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_INHERIT_PROP, &zc)) != 0) {
		return (zfs_standard_error(hdl, errno, errbuf));
	} else {

		if ((ret = changelist_postfix(cl)) != 0)
			goto error;

		/*
		 * Refresh the statistics so the new property is reflected.
		 */
		(void) get_stats(zhp);
	}

error:
	changelist_free(cl);
	return (ret);
}

/*
 * True DSL properties are stored in an nvlist.  The following two functions
 * extract them appropriately.
 */
static uint64_t
getprop_uint64(zfs_handle_t *zhp, zfs_prop_t prop, char **source)
{
	nvlist_t *nv;
	uint64_t value;

	*source = NULL;
	if (nvlist_lookup_nvlist(zhp->zfs_props,
	    zfs_prop_to_name(prop), &nv) == 0) {
		verify(nvlist_lookup_uint64(nv, ZPROP_VALUE, &value) == 0);
		(void) nvlist_lookup_string(nv, ZPROP_SOURCE, source);
	} else {
		verify(!zhp->zfs_props_table ||
		    zhp->zfs_props_table[prop] == B_TRUE);
		value = zfs_prop_default_numeric(prop);
		*source = "";
	}

	return (value);
}

static const char *
getprop_string(zfs_handle_t *zhp, zfs_prop_t prop, char **source)
{
	nvlist_t *nv;
	const char *value;

	*source = NULL;
	if (nvlist_lookup_nvlist(zhp->zfs_props,
	    zfs_prop_to_name(prop), &nv) == 0) {
		value = fnvlist_lookup_string(nv, ZPROP_VALUE);
		(void) nvlist_lookup_string(nv, ZPROP_SOURCE, source);
	} else {
		verify(!zhp->zfs_props_table ||
		    zhp->zfs_props_table[prop] == B_TRUE);
		value = zfs_prop_default_string(prop);
		*source = "";
	}

	return (value);
}

static boolean_t
zfs_is_recvd_props_mode(zfs_handle_t *zhp)
{
	return (zhp->zfs_props == zhp->zfs_recvd_props);
}

static void
zfs_set_recvd_props_mode(zfs_handle_t *zhp, uint64_t *cookie)
{
	*cookie = (uint64_t)(uintptr_t)zhp->zfs_props;
	zhp->zfs_props = zhp->zfs_recvd_props;
}

static void
zfs_unset_recvd_props_mode(zfs_handle_t *zhp, uint64_t *cookie)
{
	zhp->zfs_props = (nvlist_t *)(uintptr_t)*cookie;
	*cookie = 0;
}

/*
 * Internal function for getting a numeric property.  Both zfs_prop_get() and
 * zfs_prop_get_int() are built using this interface.
 *
 * Certain properties can be overridden using 'mount -o'.  In this case, scan
 * the contents of the /etc/mnttab entry, searching for the appropriate options.
 * If they differ from the on-disk values, report the current values and mark
 * the source "temporary".
 */
static int
get_numeric_property(zfs_handle_t *zhp, zfs_prop_t prop, zprop_source_t *src,
    char **source, uint64_t *val)
{
	zfs_cmd_t zc = { 0 };
	nvlist_t *zplprops = NULL;
	struct mnttab mnt;
	char *mntopt_on = NULL;
	char *mntopt_off = NULL;
	boolean_t received = zfs_is_recvd_props_mode(zhp);

	*source = NULL;

	switch (prop) {
	case ZFS_PROP_ATIME:
		mntopt_on = MNTOPT_ATIME;
		mntopt_off = MNTOPT_NOATIME;
		break;

	case ZFS_PROP_DEVICES:
		mntopt_on = MNTOPT_DEVICES;
		mntopt_off = MNTOPT_NODEVICES;
		break;

	case ZFS_PROP_EXEC:
		mntopt_on = MNTOPT_EXEC;
		mntopt_off = MNTOPT_NOEXEC;
		break;

	case ZFS_PROP_READONLY:
		mntopt_on = MNTOPT_RO;
		mntopt_off = MNTOPT_RW;
		break;

	case ZFS_PROP_SETUID:
		mntopt_on = MNTOPT_SETUID;
		mntopt_off = MNTOPT_NOSETUID;
		break;

	case ZFS_PROP_XATTR:
		mntopt_on = MNTOPT_XATTR;
		mntopt_off = MNTOPT_NOXATTR;
		break;

	case ZFS_PROP_NBMAND:
		mntopt_on = MNTOPT_NBMAND;
		mntopt_off = MNTOPT_NONBMAND;
		break;

	default:
		break;
	}

	/*
	 * Because looking up the mount options is potentially expensive
	 * (iterating over all of /etc/mnttab), we defer its calculation until
	 * we're looking up a property which requires its presence.
	 */
	if (!zhp->zfs_mntcheck &&
	    (mntopt_on != NULL || prop == ZFS_PROP_MOUNTED)) {
		libzfs_handle_t *hdl = zhp->zfs_hdl;
		struct mnttab entry;

		if (libzfs_mnttab_find(hdl, zhp->zfs_name, &entry) == 0) {
			zhp->zfs_mntopts = zfs_strdup(hdl,
			    entry.mnt_mntopts);
			if (zhp->zfs_mntopts == NULL)
				return (-1);
		}

		zhp->zfs_mntcheck = B_TRUE;
	}

	if (zhp->zfs_mntopts == NULL)
		mnt.mnt_mntopts = "";
	else
		mnt.mnt_mntopts = zhp->zfs_mntopts;

	switch (prop) {
	case ZFS_PROP_ATIME:
	case ZFS_PROP_DEVICES:
	case ZFS_PROP_EXEC:
	case ZFS_PROP_READONLY:
	case ZFS_PROP_SETUID:
	case ZFS_PROP_XATTR:
	case ZFS_PROP_NBMAND:
		*val = getprop_uint64(zhp, prop, source);

		if (received)
			break;

		if (hasmntopt(&mnt, mntopt_on) && !*val) {
			*val = B_TRUE;
			if (src)
				*src = ZPROP_SRC_TEMPORARY;
		} else if (hasmntopt(&mnt, mntopt_off) && *val) {
			*val = B_FALSE;
			if (src)
				*src = ZPROP_SRC_TEMPORARY;
		}
		break;

	case ZFS_PROP_CANMOUNT:
	case ZFS_PROP_VOLSIZE:
	case ZFS_PROP_QUOTA:
	case ZFS_PROP_REFQUOTA:
	case ZFS_PROP_RESERVATION:
	case ZFS_PROP_REFRESERVATION:
	case ZFS_PROP_FILESYSTEM_LIMIT:
	case ZFS_PROP_SNAPSHOT_LIMIT:
	case ZFS_PROP_FILESYSTEM_COUNT:
	case ZFS_PROP_SNAPSHOT_COUNT:
		*val = getprop_uint64(zhp, prop, source);

		if (*source == NULL) {
			/* not default, must be local */
			*source = zhp->zfs_name;
		}
		break;

	case ZFS_PROP_MOUNTED:
		*val = (zhp->zfs_mntopts != NULL);
		break;

	case ZFS_PROP_NUMCLONES:
		*val = zhp->zfs_dmustats.dds_num_clones;
		break;

	case ZFS_PROP_VERSION:
	case ZFS_PROP_NORMALIZE:
	case ZFS_PROP_UTF8ONLY:
	case ZFS_PROP_CASE:
		if (!zfs_prop_valid_for_type(prop, zhp->zfs_head_type) ||
		    zcmd_alloc_dst_nvlist(zhp->zfs_hdl, &zc, 0) != 0)
			return (-1);
		(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
		if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_OBJSET_ZPLPROPS, &zc)) {
			zcmd_free_nvlists(&zc);
			return (-1);
		}
		if (zcmd_read_dst_nvlist(zhp->zfs_hdl, &zc, &zplprops) != 0 ||
		    nvlist_lookup_uint64(zplprops, zfs_prop_to_name(prop),
		    val) != 0) {
			zcmd_free_nvlists(&zc);
			return (-1);
		}
		nvlist_free(zplprops);
		zcmd_free_nvlists(&zc);
		break;

	case ZFS_PROP_INCONSISTENT:
		*val = zhp->zfs_dmustats.dds_inconsistent;
		break;

	default:
		switch (zfs_prop_get_type(prop)) {
		case PROP_TYPE_NUMBER:
		case PROP_TYPE_INDEX:
			*val = getprop_uint64(zhp, prop, source);
			/*
			 * If we tried to use a default value for a
			 * readonly property, it means that it was not
			 * present.  Note this only applies to "truly"
			 * readonly properties, not set-once properties
			 * like volblocksize.
			 */
			if (zfs_prop_readonly(prop) &&
			    !zfs_prop_setonce(prop) &&
			    *source != NULL && (*source)[0] == '\0') {
				*source = NULL;
				return (-1);
			}
			break;

		case PROP_TYPE_STRING:
		default:
			zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
			    "cannot get non-numeric property"));
			return (zfs_error(zhp->zfs_hdl, EZFS_BADPROP,
			    dgettext(TEXT_DOMAIN, "internal error")));
		}
	}

	return (0);
}

/*
 * Calculate the source type, given the raw source string.
 */
static void
get_source(zfs_handle_t *zhp, zprop_source_t *srctype, char *source,
    char *statbuf, size_t statlen)
{
	if (statbuf == NULL || *srctype == ZPROP_SRC_TEMPORARY)
		return;

	if (source == NULL) {
		*srctype = ZPROP_SRC_NONE;
	} else if (source[0] == '\0') {
		*srctype = ZPROP_SRC_DEFAULT;
	} else if (strstr(source, ZPROP_SOURCE_VAL_RECVD) != NULL) {
		*srctype = ZPROP_SRC_RECEIVED;
	} else {
		if (strcmp(source, zhp->zfs_name) == 0) {
			*srctype = ZPROP_SRC_LOCAL;
		} else {
			(void) strlcpy(statbuf, source, statlen);
			*srctype = ZPROP_SRC_INHERITED;
		}
	}

}

int
zfs_prop_get_recvd(zfs_handle_t *zhp, const char *propname, char *propbuf,
    size_t proplen, boolean_t literal)
{
	zfs_prop_t prop;
	int err = 0;

	if (zhp->zfs_recvd_props == NULL)
		if (get_recvd_props_ioctl(zhp) != 0)
			return (-1);

	prop = zfs_name_to_prop(propname);

	if (prop != ZPROP_INVAL) {
		uint64_t cookie;
		if (!nvlist_exists(zhp->zfs_recvd_props, propname))
			return (-1);
		zfs_set_recvd_props_mode(zhp, &cookie);
		err = zfs_prop_get(zhp, prop, propbuf, proplen,
		    NULL, NULL, 0, literal);
		zfs_unset_recvd_props_mode(zhp, &cookie);
	} else {
		nvlist_t *propval;
		char *recvdval;
		if (nvlist_lookup_nvlist(zhp->zfs_recvd_props,
		    propname, &propval) != 0)
			return (-1);
		verify(nvlist_lookup_string(propval, ZPROP_VALUE,
		    &recvdval) == 0);
		(void) strlcpy(propbuf, recvdval, proplen);
	}

	return (err == 0 ? 0 : -1);
}

static int
get_clones_string(zfs_handle_t *zhp, char *propbuf, size_t proplen)
{
	nvlist_t *value;
	nvpair_t *pair;

	value = zfs_get_clones_nvl(zhp);
	if (value == NULL)
		return (-1);

	propbuf[0] = '\0';
	for (pair = nvlist_next_nvpair(value, NULL); pair != NULL;
	    pair = nvlist_next_nvpair(value, pair)) {
		if (propbuf[0] != '\0')
			(void) strlcat(propbuf, ",", proplen);
		(void) strlcat(propbuf, nvpair_name(pair), proplen);
	}

	return (0);
}

struct get_clones_arg {
	uint64_t numclones;
	nvlist_t *value;
	const char *origin;
	char buf[ZFS_MAX_DATASET_NAME_LEN];
};

int
get_clones_cb(zfs_handle_t *zhp, void *arg)
{
	struct get_clones_arg *gca = arg;

	if (gca->numclones == 0) {
		zfs_close(zhp);
		return (0);
	}

	if (zfs_prop_get(zhp, ZFS_PROP_ORIGIN, gca->buf, sizeof (gca->buf),
	    NULL, NULL, 0, B_TRUE) != 0)
		goto out;
	if (strcmp(gca->buf, gca->origin) == 0) {
		fnvlist_add_boolean(gca->value, zfs_get_name(zhp));
		gca->numclones--;
	}

out:
	(void) zfs_iter_children(zhp, get_clones_cb, gca);
	zfs_close(zhp);
	return (0);
}

nvlist_t *
zfs_get_clones_nvl(zfs_handle_t *zhp)
{
	nvlist_t *nv, *value;

	if (nvlist_lookup_nvlist(zhp->zfs_props,
	    zfs_prop_to_name(ZFS_PROP_CLONES), &nv) != 0) {
		struct get_clones_arg gca;

		/*
		 * if this is a snapshot, then the kernel wasn't able
		 * to get the clones.  Do it by slowly iterating.
		 */
		if (zhp->zfs_type != ZFS_TYPE_SNAPSHOT)
			return (NULL);
		if (nvlist_alloc(&nv, NV_UNIQUE_NAME, 0) != 0)
			return (NULL);
		if (nvlist_alloc(&value, NV_UNIQUE_NAME, 0) != 0) {
			nvlist_free(nv);
			return (NULL);
		}

		gca.numclones = zfs_prop_get_int(zhp, ZFS_PROP_NUMCLONES);
		gca.value = value;
		gca.origin = zhp->zfs_name;

		if (gca.numclones != 0) {
			zfs_handle_t *root;
			char pool[ZFS_MAX_DATASET_NAME_LEN];
			char *cp = pool;

			/* get the pool name */
			(void) strlcpy(pool, zhp->zfs_name, sizeof (pool));
			(void) strsep(&cp, "/@");
			root = zfs_open(zhp->zfs_hdl, pool,
			    ZFS_TYPE_FILESYSTEM);

			(void) get_clones_cb(root, &gca);
		}

		if (gca.numclones != 0 ||
		    nvlist_add_nvlist(nv, ZPROP_VALUE, value) != 0 ||
		    nvlist_add_nvlist(zhp->zfs_props,
		    zfs_prop_to_name(ZFS_PROP_CLONES), nv) != 0) {
			nvlist_free(nv);
			nvlist_free(value);
			return (NULL);
		}
		nvlist_free(nv);
		nvlist_free(value);
		verify(0 == nvlist_lookup_nvlist(zhp->zfs_props,
		    zfs_prop_to_name(ZFS_PROP_CLONES), &nv));
	}

	verify(nvlist_lookup_nvlist(nv, ZPROP_VALUE, &value) == 0);

	return (value);
}

/*
 * Accepts a property and value and checks that the value
 * matches the one found by the channel program. If they are
 * not equal, print both of them.
 */
void
zcp_check(zfs_handle_t *zhp, zfs_prop_t prop, uint64_t intval,
    const char *strval)
{
	if (!zhp->zfs_hdl->libzfs_prop_debug)
		return;
	int error;
	char *poolname = zhp->zpool_hdl->zpool_name;
	const char *program =
	    "args = ...\n"
	    "ds = args['dataset']\n"
	    "prop = args['property']\n"
	    "value, setpoint = zfs.get_prop(ds, prop)\n"
	    "return {value=value, setpoint=setpoint}\n";
	nvlist_t *outnvl;
	nvlist_t *retnvl;
	nvlist_t *argnvl = fnvlist_alloc();

	fnvlist_add_string(argnvl, "dataset", zhp->zfs_name);
	fnvlist_add_string(argnvl, "property", zfs_prop_to_name(prop));

	error = lzc_channel_program_nosync(poolname, program,
	    10 * 1000 * 1000, 10 * 1024 * 1024, argnvl, &outnvl);

	if (error == 0) {
		retnvl = fnvlist_lookup_nvlist(outnvl, "return");
		if (zfs_prop_get_type(prop) == PROP_TYPE_NUMBER) {
			int64_t ans;
			error = nvlist_lookup_int64(retnvl, "value", &ans);
			if (error != 0) {
				(void) fprintf(stderr, "zcp check error: %u\n",
				    error);
				return;
			}
			if (ans != intval) {
				(void) fprintf(stderr,
				    "%s: zfs found %lld, but zcp found %lld\n",
				    zfs_prop_to_name(prop),
				    (longlong_t)intval, (longlong_t)ans);
			}
		} else {
			char *str_ans;
			error = nvlist_lookup_string(retnvl, "value", &str_ans);
			if (error != 0) {
				(void) fprintf(stderr, "zcp check error: %u\n",
				    error);
				return;
			}
			if (strcmp(strval, str_ans) != 0) {
				(void) fprintf(stderr,
				    "%s: zfs found %s, but zcp found %s\n",
				    zfs_prop_to_name(prop),
				    strval, str_ans);
			}
		}
	} else {
		(void) fprintf(stderr,
		    "zcp check failed, channel program error: %u\n", error);
	}
	nvlist_free(argnvl);
	nvlist_free(outnvl);
}

/*
 * Retrieve a property from the given object.  If 'literal' is specified, then
 * numbers are left as exact values.  Otherwise, numbers are converted to a
 * human-readable form.
 *
 * Returns 0 on success, or -1 on error.
 */
int
zfs_prop_get(zfs_handle_t *zhp, zfs_prop_t prop, char *propbuf, size_t proplen,
    zprop_source_t *src, char *statbuf, size_t statlen, boolean_t literal)
{
	char *source = NULL;
	uint64_t val;
	const char *str;
	const char *strval;
	boolean_t received = zfs_is_recvd_props_mode(zhp);

	/*
	 * Check to see if this property applies to our object
	 */
	if (!zfs_prop_valid_for_type(prop, zhp->zfs_type))
		return (-1);

	if (received && zfs_prop_readonly(prop))
		return (-1);

	if (src)
		*src = ZPROP_SRC_NONE;

	switch (prop) {
	case ZFS_PROP_CREATION:
		/*
		 * 'creation' is a time_t stored in the statistics.  We convert
		 * this into a string unless 'literal' is specified.
		 */
		{
			val = getprop_uint64(zhp, prop, &source);
			time_t time = (time_t)val;
			struct tm t;

			if (literal ||
			    localtime_r(&time, &t) == NULL ||
			    strftime(propbuf, proplen, "%a %b %e %k:%M %Y",
			    &t) == 0)
				(void) snprintf(propbuf, proplen, "%llu", val);
		}
		zcp_check(zhp, prop, val, NULL);
		break;

	case ZFS_PROP_MOUNTPOINT:
		/*
		 * Getting the precise mountpoint can be tricky.
		 *
		 *  - for 'none' or 'legacy', return those values.
		 *  - for inherited mountpoints, we want to take everything
		 *    after our ancestor and append it to the inherited value.
		 *
		 * If the pool has an alternate root, we want to prepend that
		 * root to any values we return.
		 */

		str = getprop_string(zhp, prop, &source);

		if (str[0] == '/') {
			char buf[MAXPATHLEN];
			char *root = buf;
			const char *relpath;

			/*
			 * If we inherit the mountpoint, even from a dataset
			 * with a received value, the source will be the path of
			 * the dataset we inherit from. If source is
			 * ZPROP_SOURCE_VAL_RECVD, the received value is not
			 * inherited.
			 */
			if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) {
				relpath = "";
			} else {
				relpath = zhp->zfs_name + strlen(source);
				if (relpath[0] == '/')
					relpath++;
			}

			if ((zpool_get_prop(zhp->zpool_hdl,
			    ZPOOL_PROP_ALTROOT, buf, MAXPATHLEN, NULL,
			    B_FALSE)) || (strcmp(root, "-") == 0))
				root[0] = '\0';
			/*
			 * Special case an alternate root of '/'. This will
			 * avoid having multiple leading slashes in the
			 * mountpoint path.
			 */
			if (strcmp(root, "/") == 0)
				root++;

			/*
			 * If the mountpoint is '/' then skip over this
			 * if we are obtaining either an alternate root or
			 * an inherited mountpoint.
			 */
			if (str[1] == '\0' && (root[0] != '\0' ||
			    relpath[0] != '\0'))
				str++;

			if (relpath[0] == '\0')
				(void) snprintf(propbuf, proplen, "%s%s",
				    root, str);
			else
				(void) snprintf(propbuf, proplen, "%s%s%s%s",
				    root, str, relpath[0] == '@' ? "" : "/",
				    relpath);
		} else {
			/* 'legacy' or 'none' */
			(void) strlcpy(propbuf, str, proplen);
		}
		zcp_check(zhp, prop, 0, propbuf);
		break;

	case ZFS_PROP_ORIGIN:
		str = getprop_string(zhp, prop, &source);
		if (str == NULL)
			return (-1);
		(void) strlcpy(propbuf, str, proplen);
		zcp_check(zhp, prop, 0, str);
		break;

	case ZFS_PROP_CLONES:
		if (get_clones_string(zhp, propbuf, proplen) != 0)
			return (-1);
		break;

	case ZFS_PROP_QUOTA:
	case ZFS_PROP_REFQUOTA:
	case ZFS_PROP_RESERVATION:
	case ZFS_PROP_REFRESERVATION:

		if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
			return (-1);
		/*
		 * If quota or reservation is 0, we translate this into 'none'
		 * (unless literal is set), and indicate that it's the default
		 * value.  Otherwise, we print the number nicely and indicate
		 * that its set locally.
		 */
		if (val == 0) {
			if (literal)
				(void) strlcpy(propbuf, "0", proplen);
			else
				(void) strlcpy(propbuf, "none", proplen);
		} else {
			if (literal)
				(void) snprintf(propbuf, proplen, "%llu",
				    (u_longlong_t)val);
			else
				zfs_nicenum(val, propbuf, proplen);
		}
		zcp_check(zhp, prop, val, NULL);
		break;

	case ZFS_PROP_FILESYSTEM_LIMIT:
	case ZFS_PROP_SNAPSHOT_LIMIT:
	case ZFS_PROP_FILESYSTEM_COUNT:
	case ZFS_PROP_SNAPSHOT_COUNT:

		if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
			return (-1);

		/*
		 * If limit is UINT64_MAX, we translate this into 'none' (unless
		 * literal is set), and indicate that it's the default value.
		 * Otherwise, we print the number nicely and indicate that it's
		 * set locally.
		 */
		if (literal) {
			(void) snprintf(propbuf, proplen, "%llu",
			    (u_longlong_t)val);
		} else if (val == UINT64_MAX) {
			(void) strlcpy(propbuf, "none", proplen);
		} else {
			zfs_nicenum(val, propbuf, proplen);
		}

		zcp_check(zhp, prop, val, NULL);
		break;

	case ZFS_PROP_REFRATIO:
	case ZFS_PROP_COMPRESSRATIO:
		if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
			return (-1);
		(void) snprintf(propbuf, proplen, "%llu.%02llux",
		    (u_longlong_t)(val / 100),
		    (u_longlong_t)(val % 100));
		zcp_check(zhp, prop, val, NULL);
		break;

	case ZFS_PROP_TYPE:
		switch (zhp->zfs_type) {
		case ZFS_TYPE_FILESYSTEM:
			str = "filesystem";
			break;
		case ZFS_TYPE_VOLUME:
			str = "volume";
			break;
		case ZFS_TYPE_SNAPSHOT:
			str = "snapshot";
			break;
		case ZFS_TYPE_BOOKMARK:
			str = "bookmark";
			break;
		default:
			abort();
		}
		(void) snprintf(propbuf, proplen, "%s", str);
		zcp_check(zhp, prop, 0, propbuf);
		break;

	case ZFS_PROP_MOUNTED:
		/*
		 * The 'mounted' property is a pseudo-property that described
		 * whether the filesystem is currently mounted.  Even though
		 * it's a boolean value, the typical values of "on" and "off"
		 * don't make sense, so we translate to "yes" and "no".
		 */
		if (get_numeric_property(zhp, ZFS_PROP_MOUNTED,
		    src, &source, &val) != 0)
			return (-1);
		if (val)
			(void) strlcpy(propbuf, "yes", proplen);
		else
			(void) strlcpy(propbuf, "no", proplen);
		break;

	case ZFS_PROP_NAME:
		/*
		 * The 'name' property is a pseudo-property derived from the
		 * dataset name.  It is presented as a real property to simplify
		 * consumers.
		 */
		(void) strlcpy(propbuf, zhp->zfs_name, proplen);
		zcp_check(zhp, prop, 0, propbuf);
		break;

	case ZFS_PROP_MLSLABEL:
		{
			m_label_t *new_sl = NULL;
			char *ascii = NULL;	/* human readable label */

			(void) strlcpy(propbuf,
			    getprop_string(zhp, prop, &source), proplen);

			if (literal || (strcasecmp(propbuf,
			    ZFS_MLSLABEL_DEFAULT) == 0))
				break;

			/*
			 * Try to translate the internal hex string to
			 * human-readable output.  If there are any
			 * problems just use the hex string.
			 */

			if (str_to_label(propbuf, &new_sl, MAC_LABEL,
			    L_NO_CORRECTION, NULL) == -1) {
				m_label_free(new_sl);
				break;
			}

			if (label_to_str(new_sl, &ascii, M_LABEL,
			    DEF_NAMES) != 0) {
				if (ascii)
					free(ascii);
				m_label_free(new_sl);
				break;
			}
			m_label_free(new_sl);

			(void) strlcpy(propbuf, ascii, proplen);
			free(ascii);
		}
		break;

	case ZFS_PROP_GUID:
	case ZFS_PROP_CREATETXG:
		/*
		 * GUIDs are stored as numbers, but they are identifiers.
		 * We don't want them to be pretty printed, because pretty
		 * printing mangles the ID into a truncated and useless value.
		 */
		if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
			return (-1);
		(void) snprintf(propbuf, proplen, "%llu", (u_longlong_t)val);
		zcp_check(zhp, prop, val, NULL);
		break;

	default:
		switch (zfs_prop_get_type(prop)) {
		case PROP_TYPE_NUMBER:
			if (get_numeric_property(zhp, prop, src,
			    &source, &val) != 0) {
				return (-1);
			}

			if (literal) {
				(void) snprintf(propbuf, proplen, "%llu",
				    (u_longlong_t)val);
			} else {
				zfs_nicenum(val, propbuf, proplen);
			}
			zcp_check(zhp, prop, val, NULL);
			break;

		case PROP_TYPE_STRING:
			str = getprop_string(zhp, prop, &source);
			if (str == NULL)
				return (-1);

			(void) strlcpy(propbuf, str, proplen);
			zcp_check(zhp, prop, 0, str);
			break;

		case PROP_TYPE_INDEX:
			if (get_numeric_property(zhp, prop, src,
			    &source, &val) != 0)
				return (-1);
			if (zfs_prop_index_to_string(prop, val, &strval) != 0)
				return (-1);

			(void) strlcpy(propbuf, strval, proplen);
			zcp_check(zhp, prop, 0, strval);
			break;

		default:
			abort();
		}
	}

	get_source(zhp, src, source, statbuf, statlen);

	return (0);
}

/*
 * Utility function to get the given numeric property.  Does no validation that
 * the given property is the appropriate type; should only be used with
 * hard-coded property types.
 */
uint64_t
zfs_prop_get_int(zfs_handle_t *zhp, zfs_prop_t prop)
{
	char *source;
	uint64_t val;

	(void) get_numeric_property(zhp, prop, NULL, &source, &val);

	return (val);
}

int
zfs_prop_set_int(zfs_handle_t *zhp, zfs_prop_t prop, uint64_t val)
{
	char buf[64];

	(void) snprintf(buf, sizeof (buf), "%llu", (longlong_t)val);
	return (zfs_prop_set(zhp, zfs_prop_to_name(prop), buf));
}

/*
 * Similar to zfs_prop_get(), but returns the value as an integer.
 */
int
zfs_prop_get_numeric(zfs_handle_t *zhp, zfs_prop_t prop, uint64_t *value,
    zprop_source_t *src, char *statbuf, size_t statlen)
{
	char *source;

	/*
	 * Check to see if this property applies to our object
	 */
	if (!zfs_prop_valid_for_type(prop, zhp->zfs_type)) {
		return (zfs_error_fmt(zhp->zfs_hdl, EZFS_PROPTYPE,
		    dgettext(TEXT_DOMAIN, "cannot get property '%s'"),
		    zfs_prop_to_name(prop)));
	}

	if (src)
		*src = ZPROP_SRC_NONE;

	if (get_numeric_property(zhp, prop, src, &source, value) != 0)
		return (-1);

	get_source(zhp, src, source, statbuf, statlen);

	return (0);
}

static int
idmap_id_to_numeric_domain_rid(uid_t id, boolean_t isuser,
    char **domainp, idmap_rid_t *ridp)
{
	idmap_get_handle_t *get_hdl = NULL;
	idmap_stat status;
	int err = EINVAL;

	if (idmap_get_create(&get_hdl) != IDMAP_SUCCESS)
		goto out;

	if (isuser) {
		err = idmap_get_sidbyuid(get_hdl, id,
		    IDMAP_REQ_FLG_USE_CACHE, domainp, ridp, &status);
	} else {
		err = idmap_get_sidbygid(get_hdl, id,
		    IDMAP_REQ_FLG_USE_CACHE, domainp, ridp, &status);
	}
	if (err == IDMAP_SUCCESS &&
	    idmap_get_mappings(get_hdl) == IDMAP_SUCCESS &&
	    status == IDMAP_SUCCESS)
		err = 0;
	else
		err = EINVAL;
out:
	if (get_hdl)
		idmap_get_destroy(get_hdl);
	return (err);
}

/*
 * convert the propname into parameters needed by kernel
 * Eg: userquota@ahrens -> ZFS_PROP_USERQUOTA, "", 126829
 * Eg: userused@matt@domain -> ZFS_PROP_USERUSED, "S-1-123-456", 789
 * Eg: groupquota@staff -> ZFS_PROP_GROUPQUOTA, "", 1234
 * Eg: groupused@staff -> ZFS_PROP_GROUPUSED, "", 1234
 * Eg: projectquota@123 -> ZFS_PROP_PROJECTQUOTA, "", 123
 * Eg: projectused@789 -> ZFS_PROP_PROJECTUSED, "", 789
 */
static int
userquota_propname_decode(const char *propname, boolean_t zoned,
    zfs_userquota_prop_t *typep, char *domain, int domainlen, uint64_t *ridp)
{
	zfs_userquota_prop_t type;
	char *cp;
	boolean_t isuser;
	boolean_t isgroup;
	boolean_t isproject;
	struct passwd *pw;
	struct group *gr;

	domain[0] = '\0';

	/* Figure out the property type ({user|group|project}{quota|space}) */
	for (type = 0; type < ZFS_NUM_USERQUOTA_PROPS; type++) {
		if (strncmp(propname, zfs_userquota_prop_prefixes[type],
		    strlen(zfs_userquota_prop_prefixes[type])) == 0)
			break;
	}
	if (type == ZFS_NUM_USERQUOTA_PROPS)
		return (EINVAL);
	*typep = type;

	isuser = (type == ZFS_PROP_USERQUOTA || type == ZFS_PROP_USERUSED ||
	    type == ZFS_PROP_USEROBJQUOTA ||
	    type == ZFS_PROP_USEROBJUSED);
	isgroup = (type == ZFS_PROP_GROUPQUOTA || type == ZFS_PROP_GROUPUSED ||
	    type == ZFS_PROP_GROUPOBJQUOTA ||
	    type == ZFS_PROP_GROUPOBJUSED);
	isproject = (type == ZFS_PROP_PROJECTQUOTA ||
	    type == ZFS_PROP_PROJECTUSED || type == ZFS_PROP_PROJECTOBJQUOTA ||
	    type == ZFS_PROP_PROJECTOBJUSED);

	cp = strchr(propname, '@') + 1;

	if (isuser && (pw = getpwnam(cp)) != NULL) {
		if (zoned && getzoneid() == GLOBAL_ZONEID)
			return (ENOENT);
		*ridp = pw->pw_uid;
	} else if (isgroup && (gr = getgrnam(cp)) != NULL) {
		if (zoned && getzoneid() == GLOBAL_ZONEID)
			return (ENOENT);
		*ridp = gr->gr_gid;
	} else if (!isproject && strchr(cp, '@')) {
		/*
		 * It's a SID name (eg "user@domain") that needs to be
		 * turned into S-1-domainID-RID.
		 */
		directory_error_t e;
		char *numericsid = NULL;
		char *end;

		if (zoned && getzoneid() == GLOBAL_ZONEID)
			return (ENOENT);
		if (isuser) {
			e = directory_sid_from_user_name(NULL,
			    cp, &numericsid);
		} else {
			e = directory_sid_from_group_name(NULL,
			    cp, &numericsid);
		}
		if (e != NULL) {
			directory_error_free(e);
			return (ENOENT);
		}
		if (numericsid == NULL)
			return (ENOENT);
		cp = numericsid;
		(void) strlcpy(domain, cp, domainlen);
		cp = strrchr(domain, '-');
		*cp = '\0';
		cp++;

		errno = 0;
		*ridp = strtoull(cp, &end, 10);
		free(numericsid);

		if (errno != 0 || *end != '\0')
			return (EINVAL);
	} else {
		/* It's a user/group/project ID (eg "12345"). */
		char *end;
		uid_t id = strtoul(cp, &end, 10);
		if (*end != '\0')
			return (EINVAL);
		if (id > MAXUID && !isproject) {
			/* It's an ephemeral ID. */
			idmap_rid_t rid;
			char *mapdomain;

			if (idmap_id_to_numeric_domain_rid(id, isuser,
			    &mapdomain, &rid) != 0)
				return (ENOENT);
			(void) strlcpy(domain, mapdomain, domainlen);
			*ridp = rid;
		} else {
			*ridp = id;
		}
	}

	return (0);
}

static int
zfs_prop_get_userquota_common(zfs_handle_t *zhp, const char *propname,
    uint64_t *propvalue, zfs_userquota_prop_t *typep)
{
	int err;
	zfs_cmd_t zc = { 0 };

	(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));

	err = userquota_propname_decode(propname,
	    zfs_prop_get_int(zhp, ZFS_PROP_ZONED),
	    typep, zc.zc_value, sizeof (zc.zc_value), &zc.zc_guid);
	zc.zc_objset_type = *typep;
	if (err)
		return (err);

	err = ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_USERSPACE_ONE, &zc);
	if (err)
		return (err);

	*propvalue = zc.zc_cookie;
	return (0);
}

int
zfs_prop_get_userquota_int(zfs_handle_t *zhp, const char *propname,
    uint64_t *propvalue)
{
	zfs_userquota_prop_t type;

	return (zfs_prop_get_userquota_common(zhp, propname, propvalue,
	    &type));
}

int
zfs_prop_get_userquota(zfs_handle_t *zhp, const char *propname,
    char *propbuf, int proplen, boolean_t literal)
{
	int err;
	uint64_t propvalue;
	zfs_userquota_prop_t type;

	err = zfs_prop_get_userquota_common(zhp, propname, &propvalue,
	    &type);

	if (err)
		return (err);

	if (literal) {
		(void) snprintf(propbuf, proplen, "%llu", propvalue);
	} else if (propvalue == 0 &&
	    (type == ZFS_PROP_USERQUOTA || type == ZFS_PROP_GROUPQUOTA ||
	    type == ZFS_PROP_USEROBJQUOTA || type == ZFS_PROP_GROUPOBJQUOTA ||
	    type == ZFS_PROP_PROJECTQUOTA || ZFS_PROP_PROJECTOBJQUOTA)) {
		(void) strlcpy(propbuf, "none", proplen);
	} else if (type == ZFS_PROP_USERQUOTA || type == ZFS_PROP_GROUPQUOTA ||
	    type == ZFS_PROP_USERUSED || type == ZFS_PROP_GROUPUSED ||
	    type == ZFS_PROP_PROJECTUSED || type == ZFS_PROP_PROJECTQUOTA) {
		zfs_nicenum(propvalue, propbuf, proplen);
	} else {
		zfs_nicenum(propvalue, propbuf, proplen);
	}
	return (0);
}

int
zfs_prop_get_written_int(zfs_handle_t *zhp, const char *propname,
    uint64_t *propvalue)
{
	int err;
	zfs_cmd_t zc = { 0 };
	const char *snapname;

	(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));

	snapname = strchr(propname, '@') + 1;
	if (strchr(snapname, '@')) {
		(void) strlcpy(zc.zc_value, snapname, sizeof (zc.zc_value));
	} else {
		/* snapname is the short name, append it to zhp's fsname */
		char *cp;

		(void) strlcpy(zc.zc_value, zhp->zfs_name,
		    sizeof (zc.zc_value));
		cp = strchr(zc.zc_value, '@');
		if (cp != NULL)
			*cp = '\0';
		(void) strlcat(zc.zc_value, "@", sizeof (zc.zc_value));
		(void) strlcat(zc.zc_value, snapname, sizeof (zc.zc_value));
	}

	err = ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_SPACE_WRITTEN, &zc);
	if (err)
		return (err);

	*propvalue = zc.zc_cookie;
	return (0);
}

int
zfs_prop_get_written(zfs_handle_t *zhp, const char *propname,
    char *propbuf, int proplen, boolean_t literal)
{
	int err;
	uint64_t propvalue;

	err = zfs_prop_get_written_int(zhp, propname, &propvalue);

	if (err)
		return (err);

	if (literal) {
		(void) snprintf(propbuf, proplen, "%llu", propvalue);
	} else {
		zfs_nicenum(propvalue, propbuf, proplen);
	}
	return (0);
}

/*
 * Returns the name of the given zfs handle.
 */
const char *
zfs_get_name(const zfs_handle_t *zhp)
{
	return (zhp->zfs_name);
}

/*
 * Returns the name of the parent pool for the given zfs handle.
 */
const char *
zfs_get_pool_name(const zfs_handle_t *zhp)
{
	return (zhp->zpool_hdl->zpool_name);
}

/*
 * Returns the type of the given zfs handle.
 */
zfs_type_t
zfs_get_type(const zfs_handle_t *zhp)
{
	return (zhp->zfs_type);
}

/*
 * Is one dataset name a child dataset of another?
 *
 * Needs to handle these cases:
 * Dataset 1	"a/foo"		"a/foo"		"a/foo"		"a/foo"
 * Dataset 2	"a/fo"		"a/foobar"	"a/bar/baz"	"a/foo/bar"
 * Descendant?	No.		No.		No.		Yes.
 */
static boolean_t
is_descendant(const char *ds1, const char *ds2)
{
	size_t d1len = strlen(ds1);

	/* ds2 can't be a descendant if it's smaller */
	if (strlen(ds2) < d1len)
		return (B_FALSE);

	/* otherwise, compare strings and verify that there's a '/' char */
	return (ds2[d1len] == '/' && (strncmp(ds1, ds2, d1len) == 0));
}

/*
 * Given a complete name, return just the portion that refers to the parent.
 * Will return -1 if there is no parent (path is just the name of the
 * pool).
 */
static int
parent_name(const char *path, char *buf, size_t buflen)
{
	char *slashp;

	(void) strlcpy(buf, path, buflen);

	if ((slashp = strrchr(buf, '/')) == NULL)
		return (-1);
	*slashp = '\0';

	return (0);
}

int
zfs_parent_name(zfs_handle_t *zhp, char *buf, size_t buflen)
{
	return (parent_name(zfs_get_name(zhp), buf, buflen));
}

/*
 * If accept_ancestor is false, then check to make sure that the given path has
 * a parent, and that it exists.  If accept_ancestor is true, then find the
 * closest existing ancestor for the given path.  In prefixlen return the
 * length of already existing prefix of the given path.  We also fetch the
 * 'zoned' property, which is used to validate property settings when creating
 * new datasets.
 */
static int
check_parents(libzfs_handle_t *hdl, const char *path, uint64_t *zoned,
    boolean_t accept_ancestor, int *prefixlen)
{
	zfs_cmd_t zc = { 0 };
	char parent[ZFS_MAX_DATASET_NAME_LEN];
	char *slash;
	zfs_handle_t *zhp;
	char errbuf[1024];
	uint64_t is_zoned;

	(void) snprintf(errbuf, sizeof (errbuf),
	    dgettext(TEXT_DOMAIN, "cannot create '%s'"), path);

	/* get parent, and check to see if this is just a pool */
	if (parent_name(path, parent, sizeof (parent)) != 0) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "missing dataset name"));
		return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
	}

	/* check to see if the pool exists */
	if ((slash = strchr(parent, '/')) == NULL)
		slash = parent + strlen(parent);
	(void) strncpy(zc.zc_name, parent, slash - parent);
	zc.zc_name[slash - parent] = '\0';
	if (ioctl(hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) != 0 &&
	    errno == ENOENT) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "no such pool '%s'"), zc.zc_name);
		return (zfs_error(hdl, EZFS_NOENT, errbuf));
	}

	/* check to see if the parent dataset exists */
	while ((zhp = make_dataset_handle(hdl, parent)) == NULL) {
		if (errno == ENOENT && accept_ancestor) {
			/*
			 * Go deeper to find an ancestor, give up on top level.
			 */
			if (parent_name(parent, parent, sizeof (parent)) != 0) {
				zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
				    "no such pool '%s'"), zc.zc_name);
				return (zfs_error(hdl, EZFS_NOENT, errbuf));
			}
		} else if (errno == ENOENT) {
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "parent does not exist"));
			return (zfs_error(hdl, EZFS_NOENT, errbuf));
		} else
			return (zfs_standard_error(hdl, errno, errbuf));
	}

	is_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
	if (zoned != NULL)
		*zoned = is_zoned;

	/* we are in a non-global zone, but parent is in the global zone */
	if (getzoneid() != GLOBAL_ZONEID && !is_zoned) {
		(void) zfs_standard_error(hdl, EPERM, errbuf);
		zfs_close(zhp);
		return (-1);
	}

	/* make sure parent is a filesystem */
	if (zfs_get_type(zhp) != ZFS_TYPE_FILESYSTEM) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "parent is not a filesystem"));
		(void) zfs_error(hdl, EZFS_BADTYPE, errbuf);
		zfs_close(zhp);
		return (-1);
	}

	zfs_close(zhp);
	if (prefixlen != NULL)
		*prefixlen = strlen(parent);
	return (0);
}

/*
 * Finds whether the dataset of the given type(s) exists.
 */
boolean_t
zfs_dataset_exists(libzfs_handle_t *hdl, const char *